env python -> env python3

python/esptool.py

@@ -1,5 +1,5 @@
 #!/usr/bin/env python
-# NB: Before sending a PR to change the above line to '#!/usr/bin/env python2', please read https://github.com/themadinventor/esptool/issues/21
+# NB: Before sending a PR to change the above line to '#!/usr/bin/env python3', please read https://github.com/themadinventor/esptool/issues/21
 #
 # ESP8266 ROM Bootloader Utility
 # https://github.com/themadinventor/esptool

python/flash_release.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 from __future__ import print_function
 import sys
 import time

python/update.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 import os
 import time