Issue with `apktools` not supporting ruby-zip 2.0 (PR #26)

Looks like we are currently waiting on https://github.com/devunwired/apktools/pull/26 (by @giginet) to be merged in 😊 

You should be able to add 👇 to your `Gemfile` to fix this:
```rb
gem "apktools", git: "https://github.com/giginet/apktools.git", branch: "ruby-zip2"
```

Run `bundle update` and you should be good 🤞 