Release 5.0 (rocksdb 5.16+ compatible release)

This is the first official release of gorocksdb. From here on in we will be incrementing major versions along with Rocksdb major versions. i.e. all 5.x releases will be rocksdb 5.x compatible, 6.x will be rocksdb 6.x compatible.

If you require a rocksdb 5.x compatible release please install a v5.x release of gorocksdb.