update readme

Author: robjtede

README.md

@@ -11,10 +11,9 @@
 
 See example folders for [`actix-server`](./actix-server/examples) and [`actix-tls`](./actix-tls/examples).
 
-### MSRV
+## MSRV
 
-Most crates in this repo's have a Minimum Supported Rust Version (MSRV) of 1.49.0. Only `actix-tls`
-and `actix-server` have MSRV of 1.54.0.
+Most crates in this repo's have a Minimum Supported Rust Version (MSRV) of 1.49.0. Only `actix-tls` and `actix-server` have MSRV of 1.54.0. As a policy, we permit MSRV increases in non-breaking releases.
 
 ## License