add option for faster upload speed

platformio.ini

@@ -179,7 +179,10 @@ extra_scripts             = pio/name-firmware.py
 framework = arduino
 board_build.flash_mode = dout
 monitor_speed = 115200
+# slow upload speed (comment this out with a ';' when building for development use)
 upload_speed = 115200
+# fast upload speed (remove ';' when building for development use)
+; upload_speed = 921600
 
 # ------------------------------------------------------------------------------
 # LIBRARIES: required dependencies