Fixing broken URL for the resource file: sample release cycle.

Author: emmajane

README.md

@@ -16,6 +16,6 @@ Reveal.js slides for various workshops and conference sessions.
 - [Sample sprint workflow 1](resources/workflow-sample-sprint-1.md)
 - [Sample sprint workflow 2](resources/workflow-sample-sprint-2.md)
 - [Sample release cycle
-  summary](resources/relase-cycle-sample-1.md)
+  summary](resources/release-cycle-sample-1.md)
 
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