Fix Readme code formatting

Change-Id: I5baef6ed6d710148749389d6f65faed0e91a2001
diff --git a/README.md b/README.md
index 0449810..48d21cd 100644
--- a/README.md
+++ b/README.md
@@ -52,7 +52,9 @@
 
 To log into the machine, run
 
+```
 $ vagrant ssh
+```
 
 ## Development and License