lib: Add BASH_IT_DEVELOPMENT_BRANCH variable

template/bash_profile.template.bash

@@ -18,6 +18,10 @@ export BASH_IT_THEME='bobby'
 # cloned bash-it with a remote other than origin such as `bash-it`.
 # export BASH_IT_REMOTE='bash-it'
 
+# (Advanced): Change this to the name of the main development branch if
+# you renamed it or if it was changed for some reason
+# export BASH_IT_DEVELOPMENT_BRANCH='master'
+
 # Your place for hosting Git repos. I use this for private repos.
 export GIT_HOSTING='git@git.domain.com'