dependencies Re: ITP: streamlit

["Rebecca N. Palmer" <rebecca_palmer@zoho.com>]

Existing discussion of this package's dependencies:
https://lists.debian.org/debian-med/2020/04/threads.html#00065

Summary:
- Python part: 2 tests depend on tensorflow (which is known to be hard 
to package), but the rest doesn't so skipping these tests is an option.
- JavaScript part: npm2deb says 100 not-yet-packaged dependencies, 
listed at https://lists.debian.org/debian-med/2020/04/msg00080.html

The true number of JavaScript dependencies could be lower because 
npm2deb depends isn't perfect (it lists missing dependencies for modules 
that are already in Debian: these might be optional dependencies, or 
modules that are packaged but not under a name it can find), or higher 
because of recursive dependencies.