Fixing typo

Author: lostintangent

README.md

@@ -99,7 +99,7 @@ In order to accomodate as many developer preferences as possible, the CodePush p
 
 1. Run `rnpm link react-native-code-push`
 
-    *Note: If you didn't already have RNPM installed, you can do so by running `npm i -g rnpm` and the executing the above command once `rnpm` is in your path.*
+    *Note: If you don't already have RNPM installed, you can do so by simply running `npm i -g rnpm` and then executing the above command.*
 
 2. Open your app's Xcode project