counter

The finished project does not work on my machine (Debian 10). After entering mix phx.server I was prompted to install rebar3, which I did. Entering mix phx.server gets me this error:

function :crypto.hmac/3 is undefined or private 

Right now, the only tests in this project are for a small helper function that pads strings.

I can think of a few other things that would benefit from testing:

• Snapshot tests on RetroHitCounter and RetroBorder
• Segment testing, to ensure that a given number is accurately represented.
• Tests that updates the values, including interruptions.

At the moment, when using the "contributors" badge, by default the whole widget including all contributors pictures is linked to an external <svg> that contains links to each individual contributor.

I think that it would be useful to be able to have these individual links directly on the readme.

Is it possible to do so in some way?