add __repr__ for Board class

Author: Adimote

robot/board.py

@@ -155,6 +155,9 @@ def close(self):
         """
         self.socket.detach()
 
+    def __repr__(self):
+        return "<{}>".format(self.__str__())
+
     def __str__(self):
         return "{} - {}".format(self.__name__, self.serial)