[ci skip] Upgrade document

nbulaj · nbulaj · commit db714bf28d56 · 2018-07-16T12:41:22.000+03:00
diff --git a/UPGRADE.md b/UPGRADE.md
@@ -0,0 +1,2 @@
+See [Upgrade Guides](https://github.com/doorkeeper-gem/doorkeeper/wiki/Migration-from-old-versions)
+in the project Wiki.

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,2 @@`
	`1`	`+See [Upgrade Guides](https://github.com/doorkeeper-gem/doorkeeper/wiki/Migration-from-old-versions)`
	`2`	`+in the project Wiki.`