For recent changelog look here:
  * https://github.com/mik3y/usb-serial-for-android/releases

v0.2.0 (unreleased)
  * Gradle, Android Studio support.
  * New driver: CP2102 (thanks Ducky).
  * New prober support: LUFA Virtual Serial, Leaflabs Maple, Teensyduino.
  * New driver methods: getCD, getCTS, getDSR, getDTR, setDTR, getRI, getRTS,
    setRTS.
  * API change: setBaudrate() has been removed; use setParameters().
  * API change: open() no longer implicitly sets the baud rate.  Clients should
    call setParameters() immediately after open(), when necessary.
  * Library version is available in `com.hoho.android.usbserial.BuildInfo`.

v0.1.0 (2012-10-12)
  * New driver: CdcAcmSerialDriver.
  * Better tuned read and write buffer sizes.

v0.0.1 (2011-12-28)
  * Initial release.
