Improper use of .then()

[jwu910]

Using await someAsyncFunction().then(//do something)

Should we be using try catch here and then continuing?

[jwu910]

execGit method returns a Promise. We do not need to use async/await here.

we should be able to call something like checkoutBranch.then(() => {//do stuff}

If we were using async await, we should not be using .then().

[jwu910]

This may resolve #6