Merge pull request Agoric#186 from Agoric/pr-template

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+<!--
+Thank you for submitting a pull request!
+
+Please delete the sections below that aren pertinent to your PR
+and then fulfill the remaining checklist items before merging.
+-->
+
+Closes #
+
+# adopt a passed proposal
+When a proposal passes on agoric-3 Mainnet, it should be included in the history that this synthetic image tracks.
+
+- [ ] before this PR, change any `fromTag` using `latest` (such as [a3p-integration](https://github.com/Agoric/agoric-sdk/blob/master/a3p-integration/package.json)) to use a fixed version (otherwise they will fail when this PR changes latest and they pick it up)
+- [ ] before merging this PR, include a link to a PR that adopts its fromTag `use-${proposalName}` (where proposalName is the part of the agoric-3-proposals proposal directory name after the colon, cf. [a3p-integration/proposals](https://github.com/Agoric/agoric-sdk/tree/master/a3p-integration/proposals#how-to-revise-this-directory-after))
+- [ ] after this PR merges, merge that other PR
+
+## image building process
+
+This should not affect other repos but be prepared that it might.
+
+## @agoric/synthetic-chain library
+These need to be published to be consumed in other apps. It's not yet on 1.0 so breaking changes are allowed, but please don't make them gratuitously.
+
+- [ ] indicate in the PR description when you expect these to be published and by whom (it's currently a manual process)
+
+## tooling improvements
+
+As long as it passes CI it should be fine.
+