WP compatibility updates

• Don't load plugin if post type doesn't support revisions
• Test with latest WordPress release

Fixes #27 (closed), #28 (closed), #29 (closed).

assigned to @ethitter

added 2 commits

• 51765e9e - Bump WP compat
• ec476128 - Update version and readme

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changed the description

added 1 commit

• dd6ac3be - PHPCS

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approved this merge request

merged

mentioned in commit 58789895