Rails 6 update#11

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flapjackfritz wants to merge 6 commits intomdub:masterfrom

covidence:rails-6

Commits on Jan 6, 2017

Quick and dirty Rails 4 support
bjeanes
committed

Commits on Aug 1, 2018

Commits on Aug 7, 2018

Hack to see how far we get with Rails 5
chendo
committed

Commits on Jan 23, 2019

Add optimistic Rails 6 integration
bjeanes
committed

Commits on May 29, 2020

Correct Actionpack 6 handler
radar
committed