pass: update formatting

pass.md

@@ -9,37 +9,51 @@ Reference
 
 ### Create
 
+``` bash
 $ pass init [-p] <gpg-id>
 $ pass git init
 $ pass git remote add origin <your.git:repository>
 $ pass git push -u --all
+```
 
 ### Store
 
+``` bash
 $ pass insert [-m] twitter.com/rsc
 $ pass generate [-n] twitter.com/rsc length
+```
 
 ### Retreive
 
+``` bash
 $ pass ls twitter.com/
 $ pass show twitter.com/rsc
+```
 
 ### Search
 
+``` bash
 $ pass find twitter.com
+```
 
 ### Management
 
+``` bash
 $ pass mv twitter.com twitter.com/rsc
 $ pass rm [-rf] twitter.com
 $ pass cp twitter.com/rsc twitter.com/ricosc
+```
 
+``` bash
 $ pass edit twitter.com/rsc
+```
 
 ### Synchronize
 
+```
 $ pass git push
 $ pass git pull
+```
 
 ## References