add changelog

CHANGELOG.md

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+## v0.1.10
+
+`phd` can now render a single page to stdout, instead of starting
+as a server. Those of us in the biz refer to this as "serverless".
+
+For example, if your Gopher site lives in `/srv/gopher` and you want
+to render the main page, just run:
+
+    phd -r / /srv/gopher
+
+This will print the raw Gopher menu to stdout!
+
+To view the "/about" page, pass that selector:
+
+    phd -r / /srv/gopher
+
+Edge computing is now Gopher-scale! Enjoy!
+
+## v0.1.9
+
+Switch to using GitHub Actions for release automation.