Only trigger if preceded by a space (e.g. not 4:30)

[lauren897]

Would love to have at least the option of not triggering this if the colon isn't preceded by a space. When trying to type a time of day (10:00, 4:30) the plugin is triggered, and if one doesn't pay attention, the :00 or :30 will be automatically replaced by an emoji. Another option would be to not trigger if a number comes before the colon.