add migration for related names #12

Job	Run time
docs	20s
lint	18s
tests (3.6, django22-postgres,django22-postgres-nativejson,django22-sqlite,django22-mysql)	35s
tests (3.6, django30-postgres,django30-postgres-nativejson)	37s
tests (3.6, django30-sqlite,django30-sqlite-nativejson)	36s
tests (3.6, django30-mysql,django30-mysql-nativejson)	36s
tests (3.6, django31-postgres,django31-postgres-nativejson)	38s
tests (3.7, django22-postgres,django22-postgres-nativejson,django22-sqlite,django22-mysql)	38s
tests (3.7, django30-postgres,django30-postgres-nativejson)	36s
tests (3.7, django30-sqlite,django30-sqlite-nativejson)	45s
tests (3.7, django30-mysql,django30-mysql-nativejson)	47s
tests (3.7, django31-postgres,django31-postgres-nativejson)	45s
tests (3.8, django22-postgres,django22-postgres-nativejson,django22-sqlite,django22-mysql)	40s
tests (3.8, django30-postgres,django30-postgres-nativejson)	37s
tests (3.8, django30-sqlite,django30-sqlite-nativejson)	36s
tests (3.8, django30-mysql,django30-mysql-nativejson)	43s
tests (3.8, django31-postgres,django31-postgres-nativejson)	37s
tests (3.9, django22-postgres,django22-postgres-nativejson,django22-sqlite,django22-mysql)	42s
tests (3.9, django30-postgres,django30-postgres-nativejson)	41s
tests (3.9, django30-sqlite,django30-sqlite-nativejson)	40s
tests (3.9, django30-mysql,django30-mysql-nativejson)	36s
tests (3.9, django31-postgres,django31-postgres-nativejson)	36s
	13m 39s

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