add Offset setting

[matzew]

adding offset setting for cfg

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[codecov]

Codecov Report

Merging #77 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #77   +/-   ##
=======================================
  Coverage   73.27%   73.27%           
=======================================
  Files          21       21           
  Lines        1351     1351           
=======================================
  Hits          990      990           
  Misses        323      323           
  Partials       38       38

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