fix: add 'apt-transport-https' to base dependencies

[dated]

Proposed changes

Adds the apt-transport-https package so that we can fetch packages over https.

Reading package lists...
E: The method driver /usr/lib/apt/methods/https could not be found.
E: Failed to fetch https://deb.nodesource.com/node_9.x/dists/xenial/InRelease
E: Some index files failed to download. They have been ignored, or old ones used instead.

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• Refactoring (improve a current implementation without adding a new feature or fixing a bug)

Checklist

• I have read the CONTRIBUTING documentation