README: pin the minimal example by its tag and a hash the reader getskrops-2

The example fetched krops 1.25.0 by a hash, which a release can't put in
its own README, since the hash covers the README.  It names the tag of
the release, which a release can, and the reader gets the hash with
nix-prefetch-git, or from Nix, evaluating the example with
lib.fakeHash.  Evaluating the tests checks that the tag is the newest
version in the changelog, or, with unreleased changes, at least as new as
the newest release, so a release can't leave it behind.

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