Show .org extension in iOS file picker

See #18

ios/Runner/Info.plist

@@ -2,8 +2,6 @@
 <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 <plist version="1.0">
 <dict>
-	<key>ITSAppUsesNonExemptEncryption</key>
-	<false/>
 	<key>CFBundleDevelopmentRegion</key>
 	<string>$(DEVELOPMENT_LANGUAGE)</string>
 	<key>CFBundleDocumentTypes</key>
@@ -53,12 +51,12 @@
 	<string>????</string>
 	<key>CFBundleVersion</key>
 	<string>$(FLUTTER_BUILD_NUMBER)</string>
+	<key>ITSAppUsesNonExemptEncryption</key>
+	<false/>
 	<key>LSRequiresIPhoneOS</key>
 	<true/>
 	<key>LSSupportsOpeningDocumentsInPlace</key>
 	<true/>
-	<key>UISupportsDocumentBrowser</key>
-	<false/>
 	<key>UILaunchStoryboardName</key>
 	<string>LaunchScreen</string>
 	<key>UIMainStoryboardFile</key>
@@ -76,14 +74,20 @@
 		<string>UIInterfaceOrientationLandscapeLeft</string>
 		<string>UIInterfaceOrientationLandscapeRight</string>
 	</array>
+	<key>UISupportsDocumentBrowser</key>
+	<false/>
 	<key>UIViewControllerBasedStatusBarAppearance</key>
 	<false/>
 	<key>UTImportedTypeDeclarations</key>
 	<array>
 		<dict>
 			<key>UTTypeConformsTo</key>
 			<array>
-				<string>public.plain-text</string>
+                <!-- This should really be 'public.plain-text', but we use
+                     'public.data' here to force the file picker to show the
+                     .org extension; see
+                     https://github.com/amake/orgro/issues/18 -->
+				<string>public.data</string>
 			</array>
 			<key>UTTypeDescription</key>
 			<string>org-mode document</string>