Merge pull request eugenp#3112 from eugenp/lor6-patch-11

Update README.md

Author: lor6

core-java-8/README.md

@@ -31,4 +31,4 @@
 - [Merging Streams in Java](http://www.baeldung.com/java-merge-streams)
 - [“Stream has already been operated upon or closed” Exception in Java](http://www.baeldung.com/java-stream-operated-upon-or-closed-exception)
 - [Display All Time Zones With GMT And UTC in Java](http://www.baeldung.com/java-time-zones)
-
+- [Copy a File with Java](http://www.baeldung.com/java-copy-file)