message: Fix jsonrpc.py format
diff: @@ -176,7 +176,7 @@ class FramedTLSClient:
  self.conn.sendall(frame)
  def _read(self):
  - size, = struct.unpack("<I", self.conn.recv(4))
  + (size,) = struct.unpack("<I", self.conn.recv(4))
  data = self.conn.recv(size)
  while len(data) < size:
  data += self.conn.recv(size - len(data))
  