Update changelog to include msrv (#550)

Author: LucioFranco

CHANGELOG.md

@@ -1,5 +1,6 @@
 # 0.2.7 (April 28, 2022)
 
+* MSRV bumped to `1.49`.
 * Add `extend()` method to `Extensions`.
 * Add `From<Authority>` and `From<PathAndQuery>` impls for `Uri`.
 * Make `HeaderName::from_static` a `const fn`.

README.md

@@ -60,6 +60,12 @@ fn main() {
 }
 ```
 
+# Supported Rust Versions
+
+This project follows the [Tokio MSRV][msrv] and is currently set to `1.49`.
+
+[msrv]: https://github.com/tokio-rs/tokio/#supported-rust-versions
+
 # License
 
 Licensed under either of