Gateway: remove superfluous Versioned inheritance

All RichPlugins are now versioned.

Author: ctrueden

src/main/java/org/scijava/Gateway.java

@@ -118,7 +118,7 @@
  * @author Mark Hiner
  * @author Curtis Rueden
  */
-public interface Gateway extends RichPlugin, Versioned {
+public interface Gateway extends RichPlugin {
 
 	/**
 	 * Perform launch operations associated with this gateway.
@@ -362,10 +362,4 @@ public interface Gateway extends RichPlugin, Versioned {
 	/** @see org.scijava.app.App#getInfo(boolean) */
 	String getInfo(boolean mem);
 
-	// -- Versioned methods --
-
-	/** @see org.scijava.app.App#getVersion() */
-	@Override
-	String getVersion();
-
 }