Mostly these are just small changes tidying up the code. An abbreviation for the book of James, Js, was added.
The reason behind this new release is because preg_replace (with switch /e) was replaced with preg_replace_callback some time ago (2013-06-25) to ensure compatibility with PHP 5.5. The release of PHP 5.5 is now some time ago, so really this change should have been pushed out into a tagged 7.x-1.4 release before now. You've now got this compatibility.