message: introduce eosio_mysql_plugin by eosBLACK team
diff: @@ -10,6 +10,7 @@ Third parties are encouraged to make pull requests to this file (`develop` branc
  | Kafka | https://github.com/TP-Lab/kafka_plugin |
  | SQL | https://github.com/asiniscalchi/eosio_sql_plugin |
  | ElasticSearch | https://github.com/EOSLaoMao/elasticsearch_plugin |
  +| MySQL | https://github.com/eosBLACK/eosio_mysqldb_plugin |
  ## DISCLAIMER:
  