Update copyrights

Author: za-arthur

LICENSE

@@ -1,6 +1,6 @@
 RUM is released under the PostgreSQL License, a liberal Open Source license, similar to the BSD or MIT licenses.
 
-Copyright (c) 2015-2017, Postgres Professional
+Copyright (c) 2015-2018, Postgres Professional
 Portions Copyright (c) 1996-2017, PostgreSQL Global Development Group
 Portions Copyright (c) 1994, The Regents of the University of California
 

README.md

@@ -33,7 +33,7 @@ It is because we need to store additional information besides keys and because
 
 ## License
 
-This module available under the same license as
+This module available under the [license](LICENSE) similar to
 [PostgreSQL](http://www.postgresql.org/about/licence/).
 
 ## Installation