use single quotes in binding loaders command line example with exclamation point

Author: jeffbmartinez

tutorials/getting-started/1.5 binding-loaders/README.md

@@ -9,7 +9,7 @@ $$$ files
 Run the compilation with:
 
 ``` text
-webpack ./entry.js bundle.js --module-bind "css=style!css"
+webpack ./entry.js bundle.js --module-bind 'css=style!css'
 ```
 
 You should see the same result: