Add Min Letter Count Feature

v0.4.0

fix readme again

Fix the mess with versions (nothing new here)

v0.3.0

fix the mess with versions

Small fixes

Use dirname instead of split

os.path.dirname() is identical to os.path.split()[0] see: https://docs.python.org/3/library/os.path.html#os.path.dirname

Update for travis

Support for new pythons (#9)

* bump version

* add 3.7 and 3.8 to travis

* remove support for 3.3

* add test for checking if letter is a string