Version 1.0.2.

In `linters.py`, have the individual test functions return a bool (Tr…

…ue if no errors), and have the `run_linters` function return an Enum member. This is to help these functions be useful when called from other scripts.

Add a description sentence in the readme to be displayed on PyPI.

Merge branch 'master' of https://github.com/johndoknjas/lintception