Version 2.1.0

Key changes in V2.1.0:

• AVR PROGMEM support.
• Piping
• Ready to use built-in commands

Breaking changes in V2.1.0:

• The response channel now uses the Stream class.
  This way it is more flexible and you don't have to
  create a class for every peripheral.

Special thanks to::

• @MrNoname3
• @Dielectric2015