Ensure esptool.py uses python2.7
Ensure esptool.py uses python2.7

esptool.py currently requires python2, but the author of esptool.py does not want to modify the shebang line. On systems where "python" points to a Python3 interpreter, directly calling esptool.py will therefore fail.
This problem can be fixed by not calling esptool.py directly, therefore not relying on esptool.py's shebang line, instead passing esptool.py as an argument to the python2.7 interpreter.
oyooyo/nodemcu-firmware,oyooyo/nodemcu-firmware,oyooyo/nodemcu-firmware,oyooyo/nodemcu-firmware