Added a link to the Module#concerning docs from the 4.1 release notes [ci skip]
Fix typo [ci skip]
Merge pull request #13373 from sbagdat/patch-1

Fix typo [ci skip]
duplication removed(DRY)
Merge pull request #13370 from abhishekjain16/refactor_rails

duplication removed(DRY)
Fix nil assignment to polymorphic belongs_to

Assigning nil to a polymorphic belongs_to would nullify its _id field by
not its _type field.

Fixes failing test from c141dfc838a5dca9f197814410fa5d44c143129c.
Regression from 1678e959e973de32287b65c52ebc6cce87148951.
document how to access mail previews. [ci skip]

/cc @pixeltrix
Always point to latest rbx and jruby in travis
make clear that config/secrets.yml passes through ERB and therefore supports ENV
Fix to_param when attribute has multibyte character
Merge pull request #13386 from rono23/fix-to-param

Fix to_param when attribute has multibyte character
Unused classes in test case
Fix PostgreSQL range tests

The changes in c4044b2 meant the tests would error on a fresh DB.
Merge pull request #13366 from vipulnsward/minitest-namespace-change

Change all `MiniTest` to `Minitest`
set encoding UTF-8 for accepting multibyte character
Fix typo: data --> date
Merge pull request #13399 from ghiculescu/patch-1

Fix typo: data --> date [ci-skip]
Merge pull request #13398 from kuldeepaggarwal/build-fixes

set encoding UTF-8 for accepting multibyte character
fix typos and grammar mistake [ci skip]
Merge pull request #13400 from nishant-cyro/docs

fix typos and grammar mistake [ci skip]