change development branch to develop

[dan-mi-sun]

I know that convention is to call the development branch develop. This is small, but may as well be consistent. This is much easier to do now, rather than later on.

Also... tbh I am lazy:

https://github.com/robbyrussell/oh-my-zsh/wiki/Plugin:git

gcd | git checkout develop

[dan-mi-sun]

@KGibb8 @sadeden @nikolai-b do you think this is worth it?

https://multiplestates.wordpress.com/2015/02/05/rename-a-local-and-remote-branch-in-git/