Fix typo
Adds 2.8 to 3.x upgrade guide - fixes #161
Adds note about Accept-Encoding -- see #161
Fixing formatting in UPGRADING.md
Merge pull request #219 from frosas/patch-1

Fix typo
Merge pull request #220 from hobodave/upgrade-guide

Upgrade guide
Projects should depend on the last minor version
Merge pull request #222 from frosas/composer-version

Projects should depend on the last minor version
CS fixes