Fix PHP warning caused by 1.3.0

Fix PHP warning caused by 1.3.0 argument sanitizing refactoring.

Minor meta tweak

Composer didn't like how license row was formatted so it's formatted again. License is same as before, just formatted correctly.

Compatibility release with a few new features

100% backwards compatible.

• Custom HTML output is now allowed (#10)
• Instance and argument sanitizing can be now reused (#11)
• Typos in filter names are fixed while keeping old names also working (#5)
• Updates WP version, plugin version and some readme tweaks

WordPress.org release

1.2.0

1.1

Make the return data structure same as /wp-json/wp/posts/. The data schema was missing some data before. Now the structure is inherited from the WP_REST_Posts_Controller as it should have from the start.

1.0

Initial release