fixes issue#434

[Txxkirsch]

added types in configuration.md

not sure if branch is correct

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 70.43%. Comparing base (44c9d81) to head (50e6ade).
⚠️ Report is 101 commits behind head on master.
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Additional details and impacted files

@@            Coverage Diff            @@
##             master     #435   +/-   ##
=========================================
  Coverage     70.43%   70.43%           
  Complexity      748      748           
=========================================
  Files            40       40           
  Lines          2601     2601           
=========================================
  Hits           1832     1832           
  Misses          769      769           

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