docs: release checklist (#757)

RELEASE.md

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+# Release checklist
+
+> List of actions to perform before issuing a new js-ipfs release
+
+- Robustness and quality
+  - [ ] Ensure that all tests are passing, this includes:
+    - [ ] unit
+    - [ ] interop
+    - [ ] sharness
+  - [ ] Run tests of the following projects with the new release:
+    - [ ] orbitdb
+    - [ ] orbit-core
+    - [ ] ipfs-log
+- Documentation
+  - [ ] Ensure that README.md is up to date
+  - [ ] Ensure that all the examples run
+- Communication
+  - [ ] Create the release issue
+  - [ ] Announcements (both pre-release and post-release)
+    - [ ] Twitter
+    - [ ] IRC