Fix markdown format typo

zhongshengping · zhongshengping · commit 905acabee9a4 · 2016-10-08T10:01:29.000+08:00
Change-Id: Id1c2a6596e983069889b4da6f8430e64260cf59a
diff --git a/README.md b/README.md
@@ -442,10 +442,10 @@ This module has beaker-rspec tests
 
 To run:
 
-``shell
+```shell
 bundle install
 bundle exec rspec spec/acceptance
-``
+```
 
 Development
 -----------
