Added a requested function to check if user has liked a post #51
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Referencing issue #42, a function has been added, wp_ulike_user_liked_post, to check if an user has liked a post.
It can be used inside the loop with wp_ulike_user_liked_post(get_current_user_id(), get_the_ID())
Returns boolean true if the user liked the post, false if the user hasn't liked the post or if there's not a logged user.