Rename master to main

[madewild]

I renamed master to main to align with current best practices.

@devironl you may need to follow these steps:

Switch to the "master" branch:

$ git checkout master

Rename it to "main":

$ git branch -m master main

Get the latest commits (and branches!) from the remote:

$ git fetch

Remove the existing tracking connection with "origin/master":

$ git branch --unset-upstream

Create a new tracking connection with the new "origin/main" branch:

$ git branch -u origin/main

[madewild]

When it's done on your side you can close this issue

[devironl]

Done :-) Thanks for the instructions