Add return-only constructor for SmartBinder

Author: headius

src/main/java/com/headius/invokebinder/SmartBinder.java

@@ -101,6 +101,16 @@ public static SmartBinder from(Class<?> retType, String[] names, Class<?>... typ
         return from(Signature.returning(retType).appendArgs(names, types));
     }
 
+    /**
+     * Create a new SmartBinder with from the given return type.
+     *
+     * @param retType the type of the return value to start with
+     * @return a new SmartBinder
+     */
+    public static SmartBinder from(Class<?> retType) {
+        return from(Signature.returning(retType));
+    }
+
     /**
      * Create a new SmartBinder with from the given types and argument name.
      *