BugFix to JavaDoc of Handle

Removed an unnecessary `</p>`. Hopefully, travis.ci will compile now.

Author: thomasWeise

src/main/java/org/optimizationBenchmarking/gui/controller/Handle.java

@@ -19,7 +19,7 @@
  * {@link org.optimizationBenchmarking.gui.controller.Result#SUCCESS
  * succeeded} or
  * {@link org.optimizationBenchmarking.gui.controller.Result#FAILURE
- * failed}. </p>
+ * failed}.
  * <p>
  * A {@link Handle} is always able to log the following levels:
  * </p>