Create a Menhir conflicts file
Create a Menhir conflicts file

Makes it easier to find out what's wrong when you change `reason_parser.mly`.
facebook/reason,chenglou/reason,yunxing/reason,cristianoc/reason,ak3n/reason,let-def/reason,let-def/reason,ak3n/reason,yunxing/reason,let-def/reason,cristianoc/reason,yunxing/reason,chenglou/reason,yunxing/reason,ak3n/reason,cristianoc/reason,facebook/reason,ak3n/reason,facebook/reason,chenglou/reason