message: Also update readme
diff: @@ -58,7 +58,7 @@ If you don't see the specific version you are on, prefer the next available vers
  ## MSRV
  -We currently have `1.54.0` pinned in CI, so any version of rustc newer than that should work.
  +We currently have `1.56.0` pinned in CI, so any version of rustc newer than that should work.
  If this is not the case, please open an issue. As a policy, we permit MSRV increases in non-breaking releases.
  ## Contributing
  