Updated the copyright year in README file

Author: sreedhars

README

@@ -6,7 +6,7 @@ doubt, this particular copy of the software is released
 under the version 2 of the GNU General Public License.
 MySQL Connector/J is brought to you by Oracle.
 
-Copyright (c) 2000, 2019, Oracle and/or its affiliates. All rights reserved.
+Copyright (c) 2000, 2020, Oracle and/or its affiliates. All rights reserved.
 
 License information can be found in the COPYING file.