change hive's copyright from 2019 to 2018 for being consistent with...

change hive's copyright from 2019 to 2018 for being consistent with github.com/apache/hive NOTICE file

NOTICE

@@ -10,7 +10,7 @@ IoTDB project uses 4 Chinese Patents:
 * 201711384490X
 * 201810111712.9
 * 201711322631.5
-* 201711319331
+* 201711319331.1
 
 According to the Apache 2.0 License. The owner of the patents, Tsinghua University,
 grant the users the right to the use of patent under the requirement of Apache 2.0 License.
@@ -20,7 +20,7 @@ grant the users the right to the use of patent under the requirement of Apache 2
 This product contains a modified portion of 'Apache Hive'
 
 Apache Hive
-Copyright 2008-2019 The Apache Software Foundation
+Copyright 2008-2018 The Apache Software Foundation
 
 This product includes software developed by The Apache Software
-Foundation (http://www.apache.org/).
\ No newline at end of file
+Foundation (http://www.apache.org/).