v1.2.12

What's Changed

• Adjust available function to let the radio receive more data immediately by @TMRh20 in #22
• Adjust begin & get RSSI function by @TMRh20 in #23
  • Remove the radioConfigured variable so the radio will be reconfigured every time begin() is called like with RF24
  • Add getRSSI() function
  • remove begin() from powerUp() function, as users will typically call begin() afterward
  • Set DPL to false in begin(), remove from powerDown() function.

Full Changelog: v1.2.11...v1.2.12