layer: prepare to release v0.3.1 (#513)

* layer: prepare to release v0.3.1

Signed-off-by: Eliza Weisman <eliza@buoyant.io>

* whitespace

tower-layer/CHANGELOG.md

@@ -1,3 +1,17 @@
+# 0.3.1 (January 7, 2021)
+
+### Added
+
+- Added `layer_fn`, for constructing a `Layer` from a function taking
+  a `Service` and returning a different `Service` ([#491])
+- Added an implementation of `Layer` for `&Layer` ([#446])
+- Multiple documentation improvements ([#487], [#490])
+
+[#491]: https://github.com/tower-rs/tower/pull/491
+[#446]: https://github.com/tower-rs/tower/pull/446
+[#487]: https://github.com/tower-rs/tower/pull/487
+[#490]: https://github.com/tower-rs/tower/pull/490
+
 # 0.3.0 (November 29, 2019)
 
 - Move layer builder from `tower-util` to tower-layer.

tower-layer/Cargo.toml

@@ -8,7 +8,7 @@ name = "tower-layer"
 #   - README.md
 # - Update CHANGELOG.md.
 # - Create "v0.1.x" git tag.
-version = "0.3.0"
+version = "0.3.1"
 authors = ["Tower Maintainers <team@tower-rs.com>"]
 license = "MIT"
 readme = "README.md"

tower-layer/src/lib.rs

@@ -1,4 +1,4 @@
-#![doc(html_root_url = "https://docs.rs/tower-layer/0.3.0-alpha.2")]
+#![doc(html_root_url = "https://docs.rs/tower-layer/0.3.1")]
 #![warn(
     missing_debug_implementations,
     missing_docs,