v1.3.0

This release removes the build-time dependency on the headers from the various GPIO libraries. In addition the following features have been added:

1. A new Sayer class that can be used to scroll text.
2. a new tm1637_say utility for use from the command line (and also to demonstrate use of Sayer.)

Add support for pigpio and pigpiod

This release adds support for using pigpio wither through the direct 'library' C interface, or using the pigpiod daemon interface.

v1.1.0

Change from 'dynamic linking' to 'dynamic loading' of the GPIO libraries.

This removes the requirement for the user to configure the library for a particular GPIO library before building,
and also removes the requirement for client programs to link against the GPIO library themselves.

v1.0.0

First release with support for libgpiod or wiringPi depending on build config.