Feature/code format pre commit

[4lm]

https://github.com/OpenEnergyPlatform/omi/pull/17#issuecomment-551166251

[codecov-io]

Codecov Report

Merging #21 into dev will increase coverage by 0.15%. The diff coverage is n/a.

@@            Coverage Diff             @@
##              dev      #21      +/-   ##
==========================================
+ Coverage   80.31%   80.46%   +0.15%     
==========================================
  Files          32       32              
  Lines        1285     1285              
  Branches      181      181              
==========================================
+ Hits         1032     1034       +2     
+ Misses        204      203       -1     
+ Partials       49       48       -1

Impacted Files	Coverage Δ
tests/test_dialects/test_oep/test_compiler.py	80% <0%> (+4.44%)	:arrow_up:

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[4lm]

Works, but doesn't play well with the Git GUI of my IDE (vs code), but works fine with the Git CLI. So will use the Git CLI from now on and will merge this PR ...

[4lm]

Just for the record: oh my, this PR is a little messy, last CI check failed because I accidently closed the PR reopened it and merged it, but the check on dev is successful, so no general problem here: https://travis-ci.org/OpenEnergyPlatform/omi/builds/608851865