Bump version in amp.php from 1.0-RC4 to 1.0
Bump version in amp.php from 1.0-RC4 to 1.0

Following step 2 in 'Creating a Release':
Bump plugin versions in amp.php (×2: the metadata block in the header and also the AMP__VERSION constant).

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