Publish instructions

CONTRIBUTING.md

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+## Publishing
+
+This package uses a custom publish flow.
+
+```sh
+npm install
+npm version patch # or minor or major
+git push && git push --tags
+npm run build
+cd npmDist
+npm publish --tag=next
+```
+
+Then test it by installing `graphql-realy@next` from npm...
+
+All good? Publish:
+
+```sh
+npm dist-tags add graphql-relay@VERSION_NUMBER latest
+```