Flow config

[local-minimum]

This test-file causes error in flow. I wasn't sure if it was good idea to omit entire node_modules since it might be useful if we use modules that use flow too.

[codecov-io]

Codecov Report

Merging #381 into master will increase coverage by <.01%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #381      +/-   ##
==========================================
+ Coverage   40.54%   40.55%   +<.01%     
==========================================
  Files         198      198              
  Lines       16801    16801              
  Branches     2930     2930              
==========================================
+ Hits         6812     6813       +1     
+ Misses       9575     9553      -22     
- Partials      414      435      +21

Impacted Files	Coverage Δ
scanomatic/data_processing/phenotyper.py	27.51% <0%> (ø)	:arrow_up:
scanomatic/qc/phenotype_results.py	0% <0%> (ø)	:arrow_up:
scanomatic/ui_server/data_api.py	9.65% <0%> (ø)	:arrow_up:
scanomatic/ui_server/general.py	22.41% <0%> (ø)	:arrow_up:
scanomatic/data_processing/phases/features.py	17.23% <0%> (ø)	:arrow_up:
scanomatic/io/source.py	18.08% <0%> (ø)	:arrow_up:
scanomatic/ui_server/tools_api.py	8.77% <0%> (ø)	:arrow_up:
scanomatic/data_processing/phases/segmentation.py	74.37% <0%> (+0.27%)	:arrow_up:

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[local-minimum]

@gdetrez I will merge this right away hoping it is fine with you, if not we can fix it next week.