Add Laravel version switch parameter

[jakebathman]

I've already used this so many times in the last few days, thanks for publishing it.

Overview

This PR adds an optional version switch in the command. If not included, the branch will fall back to the $_ENV value (defaults to master as before). This is a stripped down version of PR #3 since you're a rockstar who had already done half of the stuff 🥇

Example to search docs for Laravel 5.1:

[tillkruss]

Thanks man! Do the changes I made make sense to you?

[ryanw3b3r]

Sorry, I might misread it @tillkruss, but I don't think that if (trim($matches[1]) != "") (trimmed string is not empty) is the same as if (empty(trim($matches[1]))) (empty trimmed string) Looks like you need ! before empty?

[jakebathman]

Yeah you'll definitely need ! empty() to make that work.

Also, embarrassed to say I didn't know about \h before 🤷‍♂️

Otherwise, looks great to me.

[tillkruss]

Yes, of course @ryanw3b3r. Thanks!

LGTM. We could really use a test suite now I guess.