fix(ios): set engines

Author: jcesarmobile

package.json

@@ -30,6 +30,9 @@
   "engines": {
     "cordovaDependencies": {
       "3.0.0": {
+        "cordova-ios": ">=4.0.0"
+      },
+      "4.0.0": {
         "cordova": ">100"
       }
     }

plugin.xml

@@ -29,6 +29,10 @@
     <repo>https://github.com/apache/cordova-plugin-dialogs</repo>
     <issue>https://github.com/apache/cordova-plugin-dialogs/issues</issue>
 
+    <engines>
+            <engine name="cordova-ios" version=">=4.0.0" />
+    </engines>
+
     <js-module src="www/notification.js" name="notification">
         <merges target="navigator.notification" />
     </js-module>