fix ios install (#479)

To use this plugin on iOS you need to opt-in for the embedded views preview by adding a boolean property to the app's Info.plist file, with the key io.flutter.embedded_views_preview and the value YES.

<key>io.flutter.embedded_views_preview</key>
<true/>

place_tracker/ios/Runner/Info.plist

@@ -41,5 +41,7 @@
 	</array>
 	<key>UIViewControllerBasedStatusBarAppearance</key>
 	<false/>
+	<key>io.flutter.embedded_views_preview</key>
+	<true/>
 </dict>
 </plist>