Check most current meshtastic version

[mverch67]

This is a solution for #274 Let user know if they are not running the most current version of the cli.

It affects the --info and --support command:

$ meshtastic --info

[...]

*** A newer version v2.1.4 is available! Consider running "pip install --upgrade meshtastic" ***

$ meshtastic --support

If having issues with meshtastic cli or python library
or wish to make feature requests, visit:
https://github.com/meshtastic/python/issues
When adding an issue, be sure to include the following info:
 System: Linux
   Platform: Linux-6.2.7-200.fc37.x86_64-x86_64-with-glibc2.36
   Release: 6.2.7-200.fc37.x86_64
   Machine: x86_64
   Encoding (stdin): utf-8
   Encoding (stdout): utf-8
 meshtastic: v2.1.3 (*** newer version v2.1.4 available ***)
 Executable: /home/manuel/Documents/PlatformIO/Projects/python-fork/meshtastic/__main__.py
 Python: 3.11.2 CPython GCC 12.2.1 20221121 (Red Hat 12.2.1-4)

Please add the output from the command: meshtastic --info

[caveman99]

Good thing to add, but please read comments.