Mircea/update contributing md

[mircea-c]

• Targeted PR against correct branch (see CONTRIBUTING.md)

• Linked to github-issue with discussion and accepted design OR link to spec that describes this work.

• Wrote tests

• Updated relevant documentation (docs/)

• Added a relevant changelog entry: sdkch add [section] [stanza] [message]

• rereviewed Files changed in the github PR explorer

---

For Admin Use:

• Added appropriate labels to PR (ex. wip, ready-for-review, docs)
• Reviewers Assigned
• Squashed all commits, uses message "Merge pull request #XYZ: [title]" (coding standards)

[alexanderbez]

LGTM -- one minor nit.

[codecov]

Codecov Report

Merging #4205 into master will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4205      +/-   ##
==========================================
- Coverage   60.17%   60.16%   -0.02%     
==========================================
  Files         212      212              
  Lines       15187    15187              
==========================================
- Hits         9139     9137       -2     
- Misses       5419     5421       +2     
  Partials      629      629