Change Details

This is [createMigrate](https://github.com/rt2zz/redux-persist/blob/master/src/createMigrate.ts) code allowing to async migrations. This could potentially be patched, but this code will have more responsibilities in near future, so it's better to maintain this that way. Depends on D7289

This is [createMigrate](https://github.com/rt2zz/redux-persist/blob/master/src/createMigrate.ts) code allowing to async migrations. This could potentially be patched, but this code will have more responsibilities in near future (D7668), so it's better to maintain this that way. Depends on D7289

This is [createMigrate](https://github.com/rt2zz/redux-persist/blob/master/src/createMigrate.ts) code allowing to async migrations. This could potentially be patched, but this code will have more responsibilities in near future (D7668), so it's better to maintain this that way. Depends on D7289