Restrict Rubocop versioning
Restrict Rubocop versioning

Rubocop has many breaking changes fast, its better to restrict its version in the application to avoid causing unintended breaks for users.
cosmo0920/msgpack-ruby,msgpack/msgpack-ruby,cosmo0920/msgpack-ruby,msgpack/msgpack-ruby,msgpack/msgpack-ruby,cosmo0920/msgpack-ruby,cosmo0920/msgpack-ruby