Prepare for release 2.3.1 (#294)

CHANGELOG.md

 # Changelog
+
 All notable changes to this crate are documented in this file.
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this crate adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [2.3.1] - 2021-09-28
+
+### Fix
+
+- Improve macro hygiene of `Encode` and `Decode` proc. macro expansions. ([#291](https://github.com/paritytech/parity-scale-codec/pull/291), [#293](https://github.com/paritytech/parity-scale-codec/pull/293))
+
 ## [2.3.0] - 2021-09-11
 
 ### Added

Cargo.lock

@@ -417,7 +417,7 @@ checksum = "0ab1bc2a289d34bd04a330323ac98a1b4bc82c9d9fcb1e66b63caa84da26b575"
 
 [[package]]
 name = "parity-scale-codec"
-version = "2.3.0"
+version = "2.3.1"
 dependencies = [
  "arbitrary",
  "arrayvec",
@@ -435,7 +435,7 @@ dependencies = [
 
 [[package]]
 name = "parity-scale-codec-derive"
-version = "2.3.0"
+version = "2.3.1"
 dependencies = [
  "parity-scale-codec",
  "proc-macro-crate",

Cargo.toml

 [package]
 name = "parity-scale-codec"
 description = "SCALE - Simple Concatenating Aggregated Little Endians"
-version = "2.3.0"
+version = "2.3.1"
 authors = ["Parity Technologies <admin@parity.io>"]
 license = "Apache-2.0"
 repository = "https://github.com/paritytech/parity-scale-codec"
@@ -11,7 +11,7 @@ edition = "2018"
 [dependencies]
 arrayvec = { version = "0.7", default-features = false }
 serde = { version = "1.0.102", optional = true }
-parity-scale-codec-derive = { path = "derive", version = "2.2.0", default-features = false, optional = true }
+parity-scale-codec-derive = { path = "derive", version = "2.3.1", default-features = false, optional = true }
 bitvec = { version = "0.20.1", default-features = false, features = ["alloc"], optional = true }
 byte-slice-cast = { version = "1.0.0", default-features = false }
 generic-array = { version = "0.14.4", optional = true }

derive/Cargo.toml

 [package]
 name = "parity-scale-codec-derive"
 description = "Serialization and deserialization derive macro for Parity SCALE Codec"
-version = "2.3.0"
+version = "2.3.1"
 authors = ["Parity Technologies <admin@parity.io>"]
 license = "Apache-2.0"
 edition = "2018"