Prepare for release 2.4.0 (KnpLabs#582)

* Prepare for release 2.4.0

* Update CHANGELOG.md

* Typo

Changelog for 2.3.0 (KnpLabs#570)

* Changelog for 2.3.0

* typo

Added changelog for 2.2.0 (KnpLabs#552)

* Added changelog for 2.2.0

* Fixed typo

* Typo

Prepare for 2.1 (KnpLabs#542)

Merge pull request KnpLabs#485 from GrahamCampbell/patch-1

Fixed method docs and routing to organization projects

Not rc, but 2.0

Merge pull request KnpLabs#434 from GrahamCampbell/patch-1

Bumped min versions to address the plugin interface issues

Merge pull request KnpLabs#427 from Nyholm/patch-2

Bumped version of cache plugin

Merge pull request KnpLabs#410 from GrahamCampbell/exceptions

Fixed the exceptions

Merge pull request KnpLabs#405 from Nyholm/bugfix

Typos and bugfix