Fix User::removePost()
CS fix
Remove unused code
Fix findOne() call in DocumentPersister::exists()

The first paramter needs to be a map of fields and not a list of mappings.

Until now exists() always returned false.
Test case for DocumentPersister::exists() fix (#870)
Merge pull request #870
Version.php appendectomy

This is a relic from the pre-Composer days, so there's no longer a need for it. ORM is stuck with it until 3.0.0 but we can finally capitalize on the fact that we haven't had a stable release in five years.
Merge pull request #871 from doctrine/remove-version

Version.php appendectomy
Merge pull request #860 from szappacosta/fix-document-user

Fix User::removePost() in test fixture
Merge pull request #863 from megazoll/patch-1

CS fix and remove unused code
Fix header formatting in changelog
Fix issue links in changelog
Update documentation version to 1.0.0-BETA10