Fix link removed by error

aheritier · web-flow · commit 9ef84410318b · 2019-06-25T10:15:22.000+02:00
diff --git a/README.md b/README.md
@@ -95,3 +95,5 @@ History
 -------
 
 * See [releases](https://github.com/cloudbees/zendesk-java-client/releases)
+
+  [zd]: http://zendesk.com
