Added in this new version is support for hardware serial which is required when you are using an Arduino Mega2560 (on Serial1 or Serial2) or Leonardo (on Serial1). Supporting the Arduino Mega2560 allows bigger and more complex applications that requires larger program flash size and RAM to be implemented.
Starting from this new revision, the declaration of the software serial object must be performed outside of the library (on your sketch). All examples are updated to reflect these changes.
Take care & happy tinkering!