update copyright message

com.oracle.truffle.r.runtime/src/com/oracle/truffle/r/runtime/RRuntime.java

@@ -50,7 +50,7 @@ public class RRuntime {
     // Parts of the welcome message originate from GNU R.
     public static final String WELCOME_MESSAGE =
         "R version " + RVersionNumber.FULL + " (FastR)\n" +
-        "Copyright (c) 2013-17, Oracle and/or its affiliates\n" +
+        "Copyright (c) 2013-18, Oracle and/or its affiliates\n" +
         "Copyright (c) 1995-2017, The R Core Team\n" +
         "Copyright (c) 2017 The R Foundation for Statistical Computing\n" +
         "Copyright (c) 2012-4 Purdue University\n" +