added show_non_significant flag to annotator

[sepro]

This is a proposed solution to discussion #50 with a single flag to show/hide non-significant issues.

@trevismd: I based this on the master branch only noticed later that PR should be based on the latest dev branch, though as merging is possible I hope this isn't an issue.

[codecov[bot]]

Codecov Report

Merging #66 (fafb0c6) into dev (2a5ebe1) will decrease coverage by 0.24%. The diff coverage is 54.54%.

@@            Coverage Diff             @@
##              dev      #66      +/-   ##
==========================================
- Coverage   97.04%   96.80%   -0.25%     
==========================================
  Files          29       29              
  Lines        1898     1908      +10     
==========================================
+ Hits         1842     1847       +5     
- Misses         56       61       +5     

Impacted Files	Coverage Δ
statannotations/stats/StatResult.py	86.53% <40.00%> (-4.96%)	:arrow_down:
statannotations/Annotator.py	91.29% <66.66%> (-0.38%)	:arrow_down:

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[sepro]

https://github.com/trevismd/statannotations/pull/95 is the PR with the improved implementation, based on our discussion here.