[7.0] Fix multiply defined functions fatal error (guzzle#2699)

* Fix multiply defined functions fatal error

* Prepare for release of 7.0.1

Prepare for release of 7.0.0 (guzzle#2697)

Release 6.5.5

Prepare release RC1 (guzzle#2681)

* Prepare release RC1

* Updated date

* update help files

* revert phpunit

* minor

* Fixes

Co-authored-by: Mponos George <[email protected]>

Added change log for 7-beta2 (guzzle#2658)

* Added changelog for 7-beta2

* minor

Release 6.5.4

Release 6.5.3

Release 7.0.0-beta.1

Release 6.5.2

Release 6.5.1