Fix Changelog - Add 3.1.8

[lrljoe]

All Submissions:

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

New Feature Submissions:

1. Does your submission pass tests and did you add any new tests needed for your feature?
2. Did you update all templates (if applicable)?
3. Did you add the relevant documentation (if applicable)?
4. Did you test locally to make sure your feature works as intended?

Changes to Core Features:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your core changes, as applicable?
• Have you successfully ran tests with your changes locally?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (a0d8411) 88.67% compared to head (56195c5) 88.67%.

Additional details and impacted files

@@            Coverage Diff             @@
##             develop    #1620   +/-   ##
==========================================
  Coverage      88.67%   88.67%           
  Complexity      1354     1354           
==========================================
  Files            106      106           
  Lines           3189     3189           
==========================================
  Hits            2828     2828           
  Misses           361      361           

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