SDK should include every sequential change of the OpenAPI

[wtrocki]

Having 2 changes to the same API should be two different PR's and commits and changelogs.
Getting bulk change because of lack of PR review causing some problems as we missing what commits changed what and it is really hard to reliably change API.
This way we can actually ensure an informative changelog.

Solution for this problem is to create separate PR and branch for every event: #126

[wtrocki]

I think this is done now. Amazing work @craicoverflow