Update the stable tag to 1.5.0
1.6.0-alpha-1
Add filter callback option to post type list func

Will be used by the comment and comment removed points hooks to filter
out post types that don’t support comments.

See #96
Support post type filtering in post type base hook

Also add a function to filter based on comment support, to be used by
the Comment and Comment Removed points hooks.

See #96
Only list post types supporting comments in hooks

The Comment and Comment Removed points hooks only make sense for post
types that actually support comments.

See #96