update deis version number

With current install steps, the version reported is 2.9.1

Author: jmspring

src/quickstart/install-cli-tools.md

@@ -19,7 +19,7 @@ should move it somewhere in your $PATH:
 Check your work by running `deis version`:
 
     $ deis version
-    2.8.0
+    2.9.1
 
 !!! note
     Note that version numbers may vary as new releases become available