Update ast to version 2.3.0
Update ast to version 2.3.0

codeforamerica/follow-all,BryanH/follow-all,jasnow/follow-all,BryanH/follow-all,codeforamerica/follow-all,BryanH/follow-all,jasnow/follow-all,codeforamerica/follow-all,jasnow/follow-all