Update README.md

Author: vishr

color/README.md

@@ -4,14 +4,20 @@ Style terminal text.
 
 ## Installation
 
-```go get github.com/labstack/gommon/color```
+```sh
+go get github.com/labstack/gommon/color
+```
 
 ## Windows?
 
 Try [cmder](http://bliker.github.io/cmder) or https://github.com/mattn/go-colorable
 
 ## [Usage](https://github.com/labstack/gommon/blob/master/color/color_test.go)
 
+```sh
+import github.com/labstack/gommon/color
+```
+
 ### Colored text
 
 ```go