[hotfix][doc] remove hive connector repo link because it is still WIP

Author: JingGe

README.md

@@ -137,7 +137,6 @@ Most Flink connectors have been externalized to individual repos under the [Apac
 * [flink-connector-elasticsearch](https://github.com/apache/flink-connector-elasticsearch)
 * [flink-connector-gcp-pubsub](https://github.com/apache/flink-connector-gcp-pubsub)
 * [flink-connector-hbase](https://github.com/apache/flink-connector-hbase)
-* [flink-connector-hive](https://github.com/apache/flink-connector-hive)
 * [flink-connector-jdbc](https://github.com/apache/flink-connector-jdbc)
 * [flink-connector-kafka](https://github.com/apache/flink-connector-kafka)
 * [flink-connector-mongodb](https://github.com/apache/flink-connector-mongodb)