Fix _send function conflict

Author: vshymanskyy

BlynkLib.py

@@ -130,7 +130,7 @@ def _send(self, cmd, *args, **kwargs):
  self.log('<', cmd, id, '|', *args)
  msg = struct.pack("!BHH", cmd, id, dlen) + data
  self.lastSend = gettime()
- self._send(msg)
+ self._write(msg)
 
  def connect(self):
  if self.state != DISCONNECTED: return
@@ -221,7 +221,7 @@ def connect(self):
  except:
  raise ValueError('Connection with the Blynk servers failed')
 
- def _send(self, data):
+ def _write(self, data):
  self.conn.send(data)
  # TODO: handle disconnect