Added missing JavaDoc param description

Author: egonw

org.bridgedb/src/main/java/org/bridgedb/BridgeDb.java

@@ -77,6 +77,8 @@ public static void register(String protocol, Driver driver)
 
     /**
      * Returns the version of BridgeDb.
+     *
+     * @return a String representing the version of this BridgeDb release.
      */
     public static String getVersion() {
         if (version != null) return version;