Stabilise API

[xlotlu]

Release 1.0.7 broke the specialised matchers that are still documented here https://h2non.github.io/filetype.py/v1.0.0/match.m.html

One could make the argument that these functions are internal API since they're not officially documented in the examples, so it's ok to break them without even a minor version bump.

However, given the usefulness of these functions (e.g. for scenarios in which one only looks for images -- something often encountered in web development) please expose them officially in the examples, and keep them stable.

[h2non]

Definitively, the public interface of those functions should be managed as part of the package's public API contract.

[dosas]

Is there something left to do here?