docs: update style of install block

dougwilson · dougwilson · commit f5c7a4d5c054 · 2017-03-28T23:38:01.000-04:00
diff --git a/README.md b/README.md
@@ -10,7 +10,7 @@ Simple SQL escape and format for MySQL
 
 ## Install
 
-```bash
+```sh
 $ npm install sqlstring
 ```
 
