v2.1.0 - Release

-Added pull-up to RX pins by default for UART configs
-Defined missing Wire1 for thing plus
-RTC low power alarm examples
-Watchdog timer implementation
-Default Baud rate for SVL on macOS and linux fail
-Fixed - Example MicrophoneOutput not compiling Artemis Thing Plus
-Fixed - PDM Library compilation errors
-Fixed - Serial1 Doesn’t compile for the Artemis Nano board
-Fixed - Interrupts don’t fire on change
-SPI mode fixes
-Fix bug that prevents directly changing PWM frequency
-Add burst mode
-Reduce release package size