Linkify the MSRV and CI badges

Author: cuviper

README.md

@@ -2,8 +2,8 @@
 
 [![crate](https://img.shields.io/crates/v/num-integer.svg)](https://crates.io/crates/num-integer)
 [![documentation](https://docs.rs/num-integer/badge.svg)](https://docs.rs/num-integer)
-![minimum rustc 1.8](https://img.shields.io/badge/rustc-1.8+-red.svg)
-![build status](https://github.com/rust-num/num-integer/workflows/master/badge.svg)
+[![minimum rustc 1.8](https://img.shields.io/badge/rustc-1.8+-red.svg)](https://rust-lang.github.io/rfcs/2495-min-rust-version.html)
+[![build status](https://github.com/rust-num/num-integer/workflows/master/badge.svg)](https://github.com/rust-num/num-integer/actions)
 
 `Integer` trait and functions for Rust.