• Simplified [Continuous Integration with AppVeyor]([issue #671])
• Automatically add source directory to CPPPATH of Build System
• Added support for Silicon Labs SLSTK3401A (Pearl Gecko) and
  MultiTech mDot F411 ARM mbed based boards
• Added support for MightyCore ATmega8535 board (issue #585)
• Added stlink as the default uploader for STM32 Discovery boards
  (issue #665)
• Use HTTP mirror for Package Manager in a case with SSL errors
  (issue #645)
• Improved firmware uploading to Arduino Leonardo/Due based boards
• Fixed bug with env_default when pio run -e is used
• Fixed issue with src_filter option for Windows OS (issue #652)
• Fixed configuration data for TI LaunchPads based on msp430fr4133 and
  msp430fr6989 MCUs (issue #676)
• Fixed issue with ARM mbed framework and multiple definition errors
  on FRDM-KL46Z board (issue #641)
• Fixed issue with ARM mbed framework when abstract class breaks
  compile for LPC1768 (issue #666)