Release prep/3.1

[MrCordeiro]

Bumped versions

[codecov]

Codecov Report

Merging #413 (ac2454b) into master (67293c4) will decrease coverage by 0.06%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #413      +/-   ##
==========================================
- Coverage   98.09%   98.02%   -0.07%     
==========================================
  Files          89       89              
  Lines        2889     2889              
==========================================
- Hits         2834     2832       -2     
- Misses         55       57       +2     

Impacted Files	Coverage Δ
wagtailmenus/__init__.py	76.47% <100.00%> (ø)
wagtailmenus/utils/version.py	84.61% <0.00%> (-15.39%)	⬇️

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