• Added support for the new boards: Atmel ATSAMR21-XPRO, Atmel
  SAML21-XPRO-B, Atmel SAMD21-XPRO, ST 32F469IDISCOVERY, ST
  32L476GDISCOVERY, ST Nucleo F031K6, ST Nucleo F042K6, ST Nucleo
  F303K8 and ST Nucleo L476RG
• Updated Arduino core for Espressif platform to 2.0.0 (issue #345)
• Added to FAQ explanation of Can not compile a library that compiles
  without issue with Arduino IDE // (issue #331)
• Fixed ESP-12E flash size (pull #333)
• Fixed configuration for LowPowerLab MoteinoMEGA board (issue
  #335)
• Fixed “LockFailed: failed to create appstate.json.lock” error for
  Windows
• Fixed relative include path for preprocessor using build_flags
  (issue #271)