Updated version number and changelog for 3.1.2

3.1.1 release (Codeception#5686)

* Deprecated expectException

* preparing 3.1.1 release

Prepared Changelog and version number for 3.1.0 release

Updated changelog and version number for 3.0.3

Updated changelog and version number

preparing 3.0.1 release

version bump

version bump

Changelog for 2.5.5

Updated changelog and version number before release