Set MSRV to 1.60 (required by phf)

Author: chifflier

.github/workflows/rust.yml

@@ -10,7 +10,7 @@ jobs:
       matrix:
         rust:
           - stable
-          - 1.57.0
+          - 1.60.0
           - nightly
     steps:
       - uses: actions/checkout@v2

README.md

@@ -4,7 +4,7 @@
 [![Apache License 2.0](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](./LICENSE-APACHE)
 [![Crates.io Version](https://img.shields.io/crates/v/tls-parser.svg)](https://crates.io/crates/tls-parser)
 [![Github CI](https://github.com/rusticata/der-parser/workflows/Continuous%20integration/badge.svg)](https://github.com/rusticata/der-parser/actions)
-[![Minimum rustc version](https://img.shields.io/badge/rustc-1.57.0+-lightgray.svg)](#rust-version-requirements)
+[![Minimum rustc version](https://img.shields.io/badge/rustc-1.60.0+-lightgray.svg)](#rust-version-requirements)
 
 # TLS Parser
 

src/lib.rs

@@ -2,7 +2,7 @@
 //! [![Apache License 2.0](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](./LICENSE-APACHE)
 //! [![Crates.io Version](https://img.shields.io/crates/v/tls-parser.svg)](https://crates.io/crates/tls-parser)
 //! [![Github CI](https://github.com/rusticata/der-parser/workflows/Continuous%20integration/badge.svg)](https://github.com/rusticata/der-parser/actions)
-//! [![Minimum rustc version](https://img.shields.io/badge/rustc-1.57.0+-lightgray.svg)](#rust-version-requirements)
+//! [![Minimum rustc version](https://img.shields.io/badge/rustc-1.60.0+-lightgray.svg)](#rust-version-requirements)
 //!
 //! # TLS Parser
 //!