Bump MSRV to 1.51.

This is needed for const generics.

Author: qwandor

.github/workflows/ci.yml

@@ -18,7 +18,7 @@ jobs:
 
         include:
           # Test MSRV
-          - rust: 1.50.0
+          - rust: 1.51.0
             TARGET: x86_64-unknown-linux-gnu
 
           # Test nightly but don't fail

README.md

@@ -35,7 +35,7 @@ These issues / PRs will be labeled as `proposal`s in the issue tracker.
 
 ## Minimum Supported Rust Version (MSRV)
 
-This crate is guaranteed to compile on stable Rust 1.50.0 and up. It *might*
+This crate is guaranteed to compile on stable Rust 1.51.0 and up. It _might_
 compile with older versions but that may change in any new patch release.
 
 ## License