Release 2.0.0 (#425)

* Release 2.0.0

* Update CHANGELOG.md

Co-authored-by: Tobias Nyholm <[email protected]>

Update date of release (#418)

Release 1.8.2 (#416)

* Release 1.8.2

* Update CHANGELOG.md

* Update CHANGELOG.md

Added changelog for 2.0 beta (#392)

* Added changelog for 2.0 beta

* Fix

* Added booleans thing to change

* Rebasee

* Use https

Prepare 1.8.1 (#404)

Prepare release 1.8.0 (#394)

* Prepare release 1.8.0

* Update CHANGELOG.md

* Remove period

Prepare for 1.7.0 release (#353)

* Prepare for 1.7.0 release

* minor

Merge pull request #283 from guzzle/null-header-value

Accept null and bool header values again

fix changelog title levels

Release 1.5.2