added author

Author: Paolo Pino

src/main/java/gwt/material/design/addins/client/avatar/MaterialAvatar.java

@@ -55,8 +55,8 @@
  * }
  * </pre>
  *
- *
  * @author paulux84
+ * @author kevzlou7979
  * @see <a href="http://gwtmaterialdesign.github.io/gwt-material-demo/#avatar">Material Avatar</a>
  */
 //@formatter:on