Oauth code in input form and add description message (mastodon#4986)

* Oauth code in a input form and add description

* New authcode description

Bump to 1.6.0

Bump version to 1.6.0rc5

Fix errors preventing UnsubscribeService from working (mastodon#4866)

Fix locking migration on statuses table. Nullable column and NO defau…

…lt value (mastodon#4825)

Bump version to 1.6.0rc2

Bump version to 1.6.0rc1 (mastodon#4768)

Bump to 1.5.1

Bump to 1.5.0

Bump to 1.5.0rc3