docs: add -S in readme

zkat · zkat · commit e3412d850fe4 · 2017-04-15T22:51:07.000-07:00
diff --git a/README.md b/README.md
@@ -21,7 +21,7 @@ passed to it, this does that!
 
 ## Install
 
-`$ npm install protoduck`
+`$ npm install -S protoduck`
 
 ## Table of Contents
 
