start tracking a changelog

docs/changelog.txt

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+changelog
+
+-- v
+
+++ A changelog.
+
++++ Auto fetching and inlining of hoots.
+
++ Upgrade image library for cleaner screenshots.
+
++ Not all summaries need labels.
+
++ Add max-width for video tag.
+
+-- 0.6.0 and prior
+
+All records from this time of primitive development have been lost.