Update for Swift 5.2 needed

[mman]

The code compiled under Linux 5.2 produces the warnings below. All related to the new semantics of handling unsafe pointers. Will you accept a PR if I provide one?

/root/exampleapp/.build/checkouts/Kitura-net/Sources/KituraNet/BufferList.swift:155:29: warning: initialization of 'UnsafeMutablePointer<UInt8>' results in a dangling pointer
        return fill(buffer: UnsafeMutablePointer(mutating: array), length: array.count)
                            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/root/exampleapp/.build/checkouts/Kitura-net/Sources/KituraNet/BufferList.swift:155:60: note: implicit argument conversion from '[UInt8]' to 'UnsafePointer<UInt8>' produces a pointer valid only for the duration of the call to 'init(mutating:)'
        return fill(buffer: UnsafeMutablePointer(mutating: array), length: array.count)
                                                           ^~~~~
/root/exampleapp/.build/checkouts/Kitura-net/Sources/KituraNet/BufferList.swift:155:60: note: use the 'withUnsafeBufferPointer' method on Array in order to explicitly convert argument to buffer pointer valid for a defined scope
        return fill(buffer: UnsafeMutablePointer(mutating: array), length: array.count)
                                                           ^
/root/exampleapp/.build/checkouts/Kitura-net/Sources/KituraNet/ClientRequest.swift:593:59: warning: initialization of 'UnsafePointer<CChar>' (aka 'UnsafePointer<Int8>') results in a dangling pointer
        curlHelperSetOptString(self.handle!, CURLOPT_URL, UnsafePointer(urlBuffer))
                                                          ^~~~~~~~~~~~~~~~~~~~~~~~
/root/exampleapp/.build/checkouts/Kitura-net/Sources/KituraNet/ClientRequest.swift:593:73: note: implicit argument conversion from '[CChar]' (aka 'Array<Int8>') to 'UnsafePointer<CChar>' (aka 'UnsafePointer<Int8>') produces a pointer valid only for the duration of the call to 'init(_:)'
        curlHelperSetOptString(self.handle!, CURLOPT_URL, UnsafePointer(urlBuffer))
                                                                        ^~~~~~~~~
/root/exampleapp/.build/checkouts/Kitura-net/Sources/KituraNet/ClientRequest.swift:593:73: note: use the 'withUnsafeBufferPointer' method on Array in order to explicitly convert argument to buffer pointer valid for a defined scope
        curlHelperSetOptString(self.handle!, CURLOPT_URL, UnsafePointer(urlBuffer))
                                                                        ^
/root/exampleapp/.build/checkouts/Kitura-net/Sources/KituraNet/ClientRequest.swift:610:50: warning: initialization of 'UnsafePointer<CChar>' (aka 'UnsafePointer<Int8>') results in a dangling pointer
            curlHelperSetUnixSocketPath(handle!, UnsafePointer(socketPath))
                                                 ^~~~~~~~~~~~~~~~~~~~~~~~~
/root/exampleapp/.build/checkouts/Kitura-net/Sources/KituraNet/ClientRequest.swift:610:64: note: implicit argument conversion from '[CChar]' (aka 'Array<Int8>') to 'UnsafePointer<CChar>' (aka 'UnsafePointer<Int8>') produces a pointer valid only for the duration of the call to 'init(_:)'
            curlHelperSetUnixSocketPath(handle!, UnsafePointer(socketPath))
                                                               ^~~~~~~~~~
/root/exampleapp/.build/checkouts/Kitura-net/Sources/KituraNet/ClientRequest.swift:610:64: note: use the 'withUnsafeBufferPointer' method on Array in order to explicitly convert argument to buffer pointer valid for a defined scope
            curlHelperSetUnixSocketPath(handle!, UnsafePointer(socketPath))
                                                               ^
/root/exampleapp/.build/checkouts/Kitura-net/Sources/KituraNet/ClientRequest.swift:653:62: warning: initialization of 'UnsafePointer<CChar>' (aka 'UnsafePointer<Int8>') results in a dangling pointer
                headersList = curl_slist_append(headersList, UnsafePointer(headerString))
                                                             ^~~~~~~~~~~~~~~~~~~~~~~~~~~
/root/exampleapp/.build/checkouts/Kitura-net/Sources/KituraNet/ClientRequest.swift:653:76: note: implicit argument conversion from '[CChar]' (aka 'Array<Int8>') to 'UnsafePointer<CChar>' (aka 'UnsafePointer<Int8>') produces a pointer valid only for the duration of the call to 'init(_:)'
                headersList = curl_slist_append(headersList, UnsafePointer(headerString))
                                                                           ^~~~~~~~~~~~
/root/exampleapp/.build/checkouts/Kitura-net/Sources/KituraNet/ClientRequest.swift:653:76: note: use the 'withUnsafeBufferPointer' method on Array in order to explicitly convert argument to buffer pointer valid for a defined scope
                headersList = curl_slist_append(headersList, UnsafePointer(headerString))
                                                                           ^
/root/exampleapp/.build/checkouts/Kitura-net/Sources/KituraNet/FastCGI/FastCGIRecordParser.swift:91:36: warning: initialization of 'UnsafeRawPointer' results in a dangling pointer
        let networkOrderedUInt16 = UnsafeRawPointer(networkOrderedBytes).assumingMemoryBound(to: UInt16.self)[0]
                                   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/root/exampleapp/.build/checkouts/Kitura-net/Sources/KituraNet/FastCGI/FastCGIRecordParser.swift:91:53: note: implicit argument conversion from '[UInt8]' to 'UnsafeRawPointer' produces a pointer valid only for the duration of the call to 'init(_:)'
        let networkOrderedUInt16 = UnsafeRawPointer(networkOrderedBytes).assumingMemoryBound(to: UInt16.self)[0]
                                                    ^~~~~~~~~~~~~~~~~~~
/root/exampleapp/.build/checkouts/Kitura-net/Sources/KituraNet/FastCGI/FastCGIRecordParser.swift:91:53: note: use the 'withUnsafeBytes' method on Array in order to explicitly convert argument to buffer pointer valid for a defined scope
        let networkOrderedUInt16 = UnsafeRawPointer(networkOrderedBytes).assumingMemoryBound(to: UInt16.self)[0]
                                                    ^
/root/exampleapp/.build/checkouts/Kitura-net/Sources/KituraNet/FastCGI/FastCGIRecordParser.swift:105:36: warning: initialization of 'UnsafeRawPointer' results in a dangling pointer
        let networkOrderedUInt32 = UnsafeRawPointer(networkOrderedBytes).assumingMemoryBound(to: UInt32.self)[0]
                                   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/root/exampleapp/.build/checkouts/Kitura-net/Sources/KituraNet/FastCGI/FastCGIRecordParser.swift:105:53: note: implicit argument conversion from '[UInt8]' to 'UnsafeRawPointer' produces a pointer valid only for the duration of the call to 'init(_:)'
        let networkOrderedUInt32 = UnsafeRawPointer(networkOrderedBytes).assumingMemoryBound(to: UInt32.self)[0]
                                                    ^~~~~~~~~~~~~~~~~~~
/root/exampleapp/.build/checkouts/Kitura-net/Sources/KituraNet/FastCGI/FastCGIRecordParser.swift:105:53: note: use the 'withUnsafeBytes' method on Array in order to explicitly convert argument to buffer pointer valid for a defined scope
        let networkOrderedUInt32 = UnsafeRawPointer(networkOrderedBytes).assumingMemoryBound(to: UInt32.self)[0]
                                                    ^
/root/exampleapp/.build/checkouts/Kitura-net/Sources/KituraNet/HTTP/HTTPServerResponse.swift:267:27: warning: initialization of 'UnsafePointer<CChar>' (aka 'UnsafePointer<Int8>') results in a dangling pointer
            buffer.append(UnsafePointer(utf8), length: utf8Length)
                          ^~~~~~~~~~~~~~~~~~~
/root/exampleapp/.build/checkouts/Kitura-net/Sources/KituraNet/HTTP/HTTPServerResponse.swift:267:41: note: implicit argument conversion from '[CChar]' (aka 'Array<Int8>') to 'UnsafePointer<CChar>' (aka 'UnsafePointer<Int8>') produces a pointer valid only for the duration of the call to 'init(_:)'
            buffer.append(UnsafePointer(utf8), length: utf8Length)
                                        ^~~~
/root/exampleapp/.build/checkouts/Kitura-net/Sources/KituraNet/HTTP/HTTPServerResponse.swift:267:41: note: use the 'withUnsafeBufferPointer' method on Array in order to explicitly convert argument to buffer pointer valid for a defined scope
            buffer.append(UnsafePointer(utf8), length: utf8Length)
                                        ^
/root/exampleapp/.build/checkouts/Kitura-net/Sources/KituraNet/HTTPParser/HTTPParser.swift:82:23: warning: initialization of 'UnsafeMutableRawPointer' results in a dangling pointer
        parser.data = UnsafeMutableRawPointer(&parseResults)
                      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/root/exampleapp/.build/checkouts/Kitura-net/Sources/KituraNet/HTTPParser/HTTPParser.swift:82:47: note: implicit argument conversion from 'ParseResults' to 'UnsafeMutableRawPointer' produces a pointer valid only for the duration of the call to 'init(_:)'
        parser.data = UnsafeMutableRawPointer(&parseResults)
                                              ^~~~~~~~~~~~~
/root/exampleapp/.build/checkouts/Kitura-net/Sources/KituraNet/HTTPParser/HTTPParser.swift:82:47: note: use 'withUnsafeMutableBytes' in order to explicitly convert argument to buffer pointer valid for a defined scope
        parser.data = UnsafeMutableRawPointer(&parseResults)

[crspybits]

Any ETA on this update? Thanks!