Add matchers to enable lte-defined Elm versions

[knuton]

I ran into a problem when adding a dependency to tesk9/accessible-html, v3.1.0:

Solving dependencies...
  ▶ No solution found: Unable to satisfy the following requirements:

- `tesk9/accessible-html (< 4.0.0)` required by `user-specified dependency`
- `tesk9/accessible-html (>= 3.1.0)` required by `user-specified dependency`

The code to determine the Elm version of a package assumes that the version constraint is always of the shape a.b.c <= v < x.y.z, but accessible-html specifies the Elm version in different way: https://github.com/tesk9/accessible-html/blob/3.1.0/elm-package.json#L23

This is a hot fix that extends the existing hack.

Ideas for a proper solution

The nice solution would be to resolve the Elm version constraints of the packages for compatibility. As far as I can see the Solve library does not offer that option.

How about adding the required Elm versions to the constraint set and adding an auto-detected (but configurable) Elm version to the graph?