Add UPGRADE.md

Evan Fossier · Evan Fossier · commit f59d4633debf · 2017-02-13T14:21:14.000-08:00
diff --git a/UPGRADE.md b/UPGRADE.md
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+# Upgrade Guide
+
+_After `6.0.0` all `MINOR` and `MAJOR` version bumps will have upgrade notes 
+posted here._
