On our first day in 490, we talked about licensing issues. Basically, you own all your code (unless, you signed a separate deal with your client).

I recommend you release your code under the MIT Open Source license and make your github repo public. This way you get protection, no one can use you for bugs in your software (yes, it could happen) while you still get authorship credit forever, as well as some exposure, which might come in handy next time you are looking for a job.