Redirects the old AMP URL to the new AMP URL if post slug is changed.
Redirects the old AMP URL to the new AMP URL if post slug is changed.

Signed-off-by: Rahul Prajapati <7ee89c81c27460df4c8eb14232b3483634772225@live.in>

ampproject/amp-toolbox-php,ampproject/amp-toolbox-php