Remove py27 support from Python sources.

[Djailla]

No description provided.

[methane]

I remove Python 2 support after 2020-01-01.

[codecov]

Codecov Report

Merging #394 into master will decrease coverage by 0.34%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #394      +/-   ##
==========================================
- Coverage   86.98%   86.64%   -0.35%     
==========================================
  Files          13       12       -1     
  Lines        1560     1535      -25     
==========================================
- Hits         1357     1330      -27     
- Misses        203      205       +2

Impacted Files	Coverage Δ
MySQLdb/cursors.py	80.84% <100%> (-0.15%)	⬇️
MySQLdb/_exceptions.py	100% <100%> (ø)	⬆️
MySQLdb/connections.py	80.28% <100%> (-2.04%)	⬇️
MySQLdb/converters.py	82.35% <100%> (-0.51%)	⬇️
MySQLdb/__init__.py	83.33% <100%> (-1.45%)	⬇️

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[methane]

thanks