Remove cocoapods references

Author: daniel-beard

Device.swift.podspec

@@ -1,11 +1,6 @@
 # Device.swift
 
-[![Language][lang-image]][lang-url]
-[![License][license-image]][license-url]
 [![Platform][platform-image]][cocoapod-url]
-[![Documentation][docs-image]][docs-url]
-[![Pod Version][pod-version-image]][cocoapod-url]
-[![Carthage Compatible][carthage-image]][carthage-url]
 
 Super-lightweight library to detect used device
 
@@ -17,32 +12,21 @@ var deviceType: DeviceType
 
 ## Install
 
-### Carthage
+### Swift Package Manager 
 
-Add the following to your `Cartfile` and follow [these instructions](https://github.com/Carthage/Carthage#adding-frameworks-to-an-application)
+Add the following to your `Package.swift` file:
 
-```bash
-github "schickling/Device.swift"
-```
-
-### CocoaPods
-
-To integrate `Device` into your project add the following to your `Podfile`:
-
-```ruby
-platform :ios, '8.0'
-use_frameworks!
-
-pod 'Device.swift'
+```swift
+dependencies: [
+    .package(url: "https://github.com/splitwise/device.swift", from: "1.2.3")
+]
 ```
 
 ## Usage
 
 ```swift
 import Device
 
-// Use import Device_swift if you're using Cocoapods
-
 let deviceType = UIDevice.current.deviceType
 
 switch deviceType {
@@ -52,30 +36,4 @@ switch deviceType {
 }
 ```
 
-## How to make release
-
-- Update pod version in podspec
-- Add tag
-- Add validate pod `pod trunk push Device.swift.podspec --allow-warnings`
-- Push to CocoaPods
-- Create release in github for with attached file for carthage
-
-```sh
-carthage build --no-skip-current
-carthage archive Device
-```
-
-Also, check out our [Documentation][docs-url]
-
-[carthage-image]: https://img.shields.io/badge/Carthage-compatible-4BC51D.svg
-[docs-image]: https://img.shields.io/cocoapods/metrics/doc-percent/Device.swift.svg
-[lang-image]: https://img.shields.io/badge/swift-4.1-orange.svg
-[license-image]: https://img.shields.io/github/license/schickling/Device.swift.svg
 [platform-image]: https://img.shields.io/cocoapods/p/Device.swift.svg
-[pod-version-image]: https://img.shields.io/cocoapods/v/Device.swift.svg
-[carthage-url]: https://github.com/Carthage/Carthage
-[cocoapod-url]: http://cocoapods.org/pods/Device.swift
-[docs-url]: http://cocoadocs.org/docsets/Device.swift
-[homepage-url]: https://github.com/schickling/Device.swift.svg
-[lang-url]: https://swift.org/
-[license-url]: LICENSE