Changing central branch's name from "master" to "main"

[CBID2]

Problem

I was scrolling through the repo and noticed that the central branch is called "master". This can create a non-inclusive environment for Black contributors from the U.S. as the word has a connotation of slavery.

Proposed Solution

I highly recommend changing the name to "main".

Benefits

1. It'll create a more inclusive contributing environment
2. GitHub has made this an official change