Meaningful error message for doorkeeper_for

Raise exception when trying to load doorkeeper version 2 with `doorkeeper_for`
syntax.

Meaningful error message for doorkeeper_for

Raise exception when trying to load doorkeeper version 2 with `doorkeeper_for`
syntax.

Releasing version 1.4.0. [ci skip]

Releasing version 1.3.1. [ci skip]

Releasing version 1.3.0.

Releasing version 1.2.0.

Releasing version 1.1.0.

Releasing version 1.0.0

Version bump

Releasing 1.0.0.rc1