Update documentation for v3.0 release

Author: darthcloud

CHANGELOG.md

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+# Changelog
+
+## [3.0] - 2018-01-03
+### Added
+ - Support PIC18F14K22 microcontroller.
+ - Real-time CRC calculation. (Fixed issue #1)
+ - Axes remapping.
+ - Layout modifier function.
+
+### Changed
+ - Configuration menu.
+ - EEPROM flexibility.
+
+### Removed
+ - Support PIC12F683 microcontroller.
+
+## [2.0] - 2011-04-20
+### Added
+ - Support PIC12F683 microcontroller.
+ - Support identify command 0xFF. (Fixed issue #2)
+ - Enable/Disable Rumple Pak emulation. (Enhancement #4)
+ - Support WaveBird. (Enhancement #5)
+ - Support 4 mapping layout.
+
+### Removed
+ - Support for PIC16F84A & PIC12F629.
+
+## [1.0] - 2004-08-07
+ - Initial version.
+