Merge pull request #220 from jgfoster/changelog_for_wire

Add `CHANGELOG.md` description for `Wire` mocks

Author: ianfixes

CHANGELOG.md

@@ -17,6 +17,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 - Definitions for Arduino zero
 - Support for mock EEPROM (but only if board supports it)
 - Add stubs for `Client.h`, `IPAddress.h`, `Printable.h`, `Server.h`, and `Udp.h`
+- `Wire` now has a mock support for the master role
 
 ### Changed
 - Move repository from https://github.com/ianfixes/arduino_ci to https://github.com/Arduino-CI/arduino_ci