Add regional indicators to list of invalid emoji for emoji mode
requested to merge benjaminrsherman/slithering-duck:stop_regional_indicators_in_emoji_mode into master
There are other emoji which can be used to simulate text, however the most common ones (and the ones which the online generators use) are the regional indicators. While we can add more emoji to this list -- for example, some zodiac signs appear similar to letters -- I don't think it's necessary.