Update serial.py
Update serial.py

updated by harland's request
sstocker46/pyrobotlab,mecax/pyrobotlab,sstocker46/pyrobotlab,mecax/pyrobotlab,MyRobotLab/pyrobotlab,MyRobotLab/pyrobotlab,MyRobotLab/pyrobotlab,MyRobotLab/pyrobotlab,sstocker46/pyrobotlab,MyRobotLab/pyrobotlab