* migrate pallet-randomness-collective-flip to new pallet attr macro

Signed-off-by: koushiro <koushiro.cqx@gmail.com>

* fix some nits

Signed-off-by: koushiro <koushiro.cqx@gmail.com>

* fix

Signed-off-by: koushiro <koushiro.cqx@gmail.com>

* some nits

Signed-off-by: koushiro <koushiro.cqx@gmail.com>

* update Substrate

Co-authored-by: parity-processbot <>