Release v1.2.3 with updated jsmodbus and fixes

• Updated to latest jsModbus
  • No more dependency on native serial port
  • uses "debug" module which modbustcp will start to take advantage of
  • uses node-net-reconnect v0.1.1 (newer releases are incompatibility with windows)
• Uses a single queue for making read requests (push/pull)
• Closes #19
  *Fix typo "datatype" -> "dataType" (thx @scottrcarlson)
• websocket "on('ready')" for node >= v9.1.1

Inital release v1.2.1

Initial release:

• ieee options
• input of multiple reads/intervals
• kill option for existing reads