Release 1.2.0

This is a fairly major release with the ability to now automatically generate or download genome-related files, such as the primary assembly, gtf, etc. files. This also comes with changes to the config.yaml file as a result

What's Changed

• Create genome reference files by @JoshLoecker in #78
• Fixed duplicate code blocks, use os.path.join instead of just join by @JoshLoecker in #79

Full Changelog: 1.1.0...1.2.0