Remove abstract render() method.

Signed-off-by: crynobone <crynobone@gmail.com>
Update keywords.

Signed-off-by: crynobone <crynobone@gmail.com>
Update changelog.

Signed-off-by: crynobone <crynobone@gmail.com>
Merge branch '2.0' into 2.1

Signed-off-by: crynobone <crynobone@gmail.com>

Conflicts:
	composer.json
Merge branch '2.1' into 2.2
Merge branch '2.2'