Sort entries

[julien-f]

Entries should be sorted to ease searches.

Problem: I think it would break automatic merging of PR created before the sort.
It should probably be done when all current PRs are merged.

[sindresorhus]

Too much hassle tbh :)

No one reads the contribution guidelines and I don't wanna do lots of work to keep it sorted.

[thiagodp]

@sindresorhus Since readme.md follows a pattern, it would be possible to create a script that sorts the packages inside the categories. It would be nice to execute it after a commit.