Update changelog for v0.2.2 release and tick version

CHANGELOG.md

@@ -7,6 +7,20 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased]
 
+## [v0.2.2] - 2018-10-25
+
+### Added
+
+- Added the Rust Code of Conduct to this repository
+- The first ADC-related trait. This is a simple trait for one-shot conversions.
+- Iterator-based blocking write and write+read traits have been added to I2C and SPI.
+- New helper constants for SPI modes.
+- A new trait for a cancellable countdown.
+- New traits for watchdog timer management, including startup, feeding, and stopping.
+
+### Changed
+- Updated docs to clarify I2C address bit widths and expectations.
+
 ## [v0.2.1] - 2018-05-14
 
 ### Changed

Cargo.toml

@@ -11,7 +11,7 @@ license = "MIT OR Apache-2.0"
 name = "embedded-hal"
 readme = "README.md"
 repository = "https://github.com/japaric/embedded-hal"
-version = "0.2.1"
+version = "0.2.2"
 
 [dependencies.void]
 default-features = false
@@ -28,4 +28,4 @@ futures = "0.1.17"
 unproven = ["nb/unstable"]
 
 [package.metadata.docs.rs]
-features = ["unproven"]
+features = ["unproven"]