Extracted usage variable to keep 79 char line limit
Changed quotation mark to single
Extracted re flags args to variable
Added SH digraph
Added TJ digraph
Corrected indentation
Added PH digraph
Added DJ digraph
Changed consonants and vowels to lowercase as we use ignorecase anyway
Fixed some whitespace according to pylint
Refactored test code and added test
Changed to single quotes
Changed l to r regexp to only change within word
Removed unnecessary capture group in e to u regexp
Clarified comments
Alphabetized regexp
Added Makefile for pre-commit hooks
Append u when word ends with r