Changes for 2.3

* New feature: Official support for ESP8266 and ESP32.
* Fixed issue #2 - Support for PROGMEM / FLASH melodies in non-blocking mode.
* Fixed issue #6 - Error compiling for board ESP32 Wrover Kit (all versions).


Changes for 2.2.1:

* Fixed issue #4: error compiling example code.
* Fixed issue #5: Refactor build process to use Arduino CLI instead of Arduino IDE.


Changes for 2.2.0:

* New feature: Build option `ANYRTTTL_BUILD_EXAMPLES` to enable/disable building AnyRtttl examples.
* New feature: Changed file/folder structure to be compatible with Arduino Library Manager.
* New feature: Using RapidAssist 0.5.0 and win32Arduino 2.3.1.


Changes for 2.1.229:

* New feature: Implemented support for RTTTL in Program Memory (PROGMEM).


Changes for 2.0.179:

* Library converted to AnyRtttl.
* First github release.
* Code originally release at http://www.end2endzone.com/anyrtttl-a-feature-rich-arduino-library-for-playing-rtttl-melodies/


Changes for 1.0.0:
* Initial release of NonBlockingRtttl.
