FIX/#8

[Zethson]

Should solve #8

@sven1103 could you very quickly glance over it, please?

I've disabled python 2, 3.4 and 3.5 support.
Python 2 is dead and should finally die. I hope that no one here still uses it.

Since I'm a fan of fstrings and IIRC those come with python 3.6 I would also drop support for 3.4 and 3.5.
Python 3.6 is the default on all Linux distributions now and I don't think that there's any reason to use 3.4 or 3.5 with 3.8 already on the horizon.

[codecov]

Codecov Report

Merging #10 into master will increase coverage by 1.69%.
The diff coverage is 92.85%.

@@            Coverage Diff             @@
##           master      #10      +/-   ##
==========================================
+ Coverage   80.48%   82.18%   +1.69%     
==========================================
  Files           4        4              
  Lines         246      247       +1     
==========================================
+ Hits          198      203       +5     
+ Misses         48       44       -4

Impacted Files	Coverage Δ
rmageddon/lint.py	82.92% <92.85%> (+3.41%)	⬆️

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