Updated README

README.md

@@ -31,7 +31,7 @@ Cordova iOS is an iOS application library that allows for Cordova-based projects
 
 Requires:
 
-* Xcode 7.x or greater. Download it at [http://developer.apple.com/downloads](http://developer.apple.com/downloads) or the [Mac App Store](http://itunes.apple.com/us/app/xcode/id497799835?mt=12).
+* Xcode 8.x or greater. Download it at [http://developer.apple.com/downloads](http://developer.apple.com/downloads) or the [Mac App Store](http://itunes.apple.com/us/app/xcode/id497799835?mt=12).
 * [node.js](https://nodejs.org)
 
 :warning: Report issues on the [Apache Cordova issue tracker](https://issues.apache.org/jira/issues/?jql=project%20%3D%20CB%20AND%20status%20in%20%28Open%2C%20%22In%20Progress%22%2C%20Reopened%29%20AND%20resolution%20%3D%20Unresolved%20AND%20component%20%3D%20%22iOS%22%20ORDER%20BY%20priority%20DESC%2C%20summary%20ASC%2C%20updatedDate%20DESC)
@@ -50,7 +50,8 @@ Updating a Cordova project
 
 When you install a new cordova-cli version that comes with a new iOS platform version, from within your project:
 
-    cordova platform update ios
+    cordova platform rm ios
+    cordova platform add ios
 
 Tests
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