update readme.md
fix headline
version bump 2.0.0 RC3
remove support for disabled spl_autoload_register()
improve Metabox markup with HTML comments
clean up main JS file
optimize update routine
remove unused file
set correct track url
add new hook with context
fix ajax notice on save
formatting
add missing method
version bump
update readme.txt
update version in composer.json to 2.0.0
update version number to 2.0.0