2.4.0

Added

• A basic main program so that it's easy to compile the project.
• Support for Teensy 3.6's LPUART0 (Serial6).
• Support for Teensy LC.
• The ability to change the transmit refresh rate, via Sender::setRefreshRate.

Changed

• Reading from a packet via Receiver::readPacket no longer disables all interrupts. Only the serial interrupts are disabled.
• The TeensyDMX constructor and destructor are now protected.
• BREAK/Mark-After-Break timing changed from 108us/12us to 180us/20us. This more closely matches the "typical" DMX BREAK timing specified in the DMX specification (ANSI E1.11).
• Some function and README documentation updates.
• Moved the kMaxDMXPacketTime constant into Receiver.

Fixed

• Added some missing disable-interrupt cases to Sender::end().