v2.0 move previous main code as script to print to stdout
v2.0 first class creation attempt
v2.0 alpha class design
v2.0 first working class & example of usage in example.py
v2.0 README update
v2.0 add keypad vs GPIO matrix dimension checking and more descriptions within code comment
v2.0 add & clarify example 2x2 2x3 4x3 keypad
v2.0 update README on issue of WiringPi 1 deprecated