Add updater notes to documentation

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diff --git a/doc/Updater.md b/doc/Updater.md
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+## Updater
+
+### Manifest
+~~~sh
+find windows/ -type f | xargs sha512sum | sed 's/windows\///' > windows-sha512.txt
+~~~
+
+### Building
+
+You can build for the current system using:
+~~~sh
+go build
+~~~
+
+You can also cross-compile for other systems by setting GOOS and GOARCH. For a
+list of supported platforms, use `go tool dist list`.
+~~~sh
+GOOS=windows GOARCH=amd64 go build
+~~~
+
+#### Removing debug information
+~~~sh
+strip updater
+~~~