Update Readme.md

make it stand out a be more readable

Author: corysimmons

Readme.md

@@ -8,7 +8,7 @@ Traditional CLI for [postcss]
 
 ## Installation
 
-npm install postcss-cli
+`npm install postcss-cli`
 
 | postcss-cli version | postcss version |
 | ---- | ---- |
@@ -165,4 +165,4 @@ MIT
 
 [postcss]: https://github.com/postcss/postcss
 [postcss-import]: https://github.com/postcss/postcss-import
-[source-map-options]: https://github.com/postcss/postcss/blob/master/docs/source-maps.md
+[source-map-options]: https://github.com/postcss/postcss/blob/master/docs/source-maps.md