v3.1.0 Release

[lrljoe]

• Update ChangeLog
• Update Docs Branch Tareget

All Submissions:

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

New Feature Submissions:

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

Changes to Core Features:

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

[codecov[bot]]

Codecov Report

Merging #1505 (e6c87f8) into v3-develop (0a52088) will not change coverage. The diff coverage is n/a.

@@              Coverage Diff              @@
##             v3-develop    #1505   +/-   ##
=============================================
  Coverage         88.08%   88.08%           
  Complexity         1251     1251           
=============================================
  Files                88       88           
  Lines              3013     3013           
=============================================
  Hits               2654     2654           
  Misses              359      359