Platformio has changed command line flag for specifying upoad port

[ryanfobel]

>> pio --version
PlatformIO, version 3.3.1

Here are the command line flags:

pio run --help
Usage: pio-script.py run [OPTIONS]

Options:
  -e, --environment TEXT
  -t, --target TEXT
  --upload-port TEXT
  -d, --project-dir PATH
  -s, --silent
  -v, --verbose
  --disable-auto-clean
  -h, --help              Show this message and exit.

Note that the flag for setting the port (used to be "--port") is now "--upload-port".