Set 2.3.0 release date

v2.2.1 official release (crankyoldgit#324)

- Bump version to v2.2.1
- Add a doc to record the release history.

v2.2.0 official release (crankyoldgit#306)

* Change version of the library to v2.2.0.

* Update README.md for v2.2

Update README.md for v2.2

Update version to 2.1.1 (crankyoldgit#274)

V2.1.0 release

* Bump library version to v2.1.0
- Feature release
  * Support sending Pronto IR codes.
  * Initial support for sending Fujitsu A/C codes.
- Minor improvements to examples.

* Add Fujitsu demo code to Travis checks. (crankyoldgit#260)

We missed adding the example code for Fujitsu A/C to Travis in PR crankyoldgit#259

Bump library version to v2.1.0

- Feature release
  * Support sending Pronto IR codes.
  * Initial support for sending Fujitsu A/C codes.
- Minor improvements to examples.

Update version to v2.0.3 (crankyoldgit#254)

- Version bump due to Issue crankyoldgit#246
- Add library version as a #define in src/IRremoteESP8266.h
- Add check to Travis config to ensure version numbers all match.

Bump version number to 2.0.2

Fix decoding issue on most protocols. (crankyoldgit#244)

- Fixes Issue crankyoldgit#243
- [bugfix] Incorrect assumption on minimum entry length when decoding. Off by one.
- [bugfix] Make matching the trailing gap/space on commands optional if we run out of buffer.
- Fix a wayward Serial.println() debug statement that got missed.
- Add unit tests to add coverage for the bug found.
- Bump version to v2.0.1