fix warning

example/ios/Podfile.lock

@@ -19,4 +19,4 @@ SPEC CHECKSUMS:
 
 PODFILE CHECKSUM: ebd43b443038e611b86ede96e613bd6033c49497
 
-COCOAPODS: 1.6.1
+COCOAPODS: 1.7.0

example/ios/Runner.xcodeproj/project.pbxproj

@@ -261,16 +261,12 @@
 			buildActionMask = 2147483647;
 			files = (
 			);
-			inputFileListPaths = (
-			);
 			inputPaths = (
 				"${PODS_ROOT}/Target Support Files/Pods-Runner/Pods-Runner-frameworks.sh",
 				"${PODS_ROOT}/../.symlinks/flutter/ios/Flutter.framework",
 				"${BUILT_PRODUCTS_DIR}/flutter_des/flutter_des.framework",
 			);
 			name = "[CP] Embed Pods Frameworks";
-			outputFileListPaths = (
-			);
 			outputPaths = (
 				"${TARGET_BUILD_DIR}/${FRAMEWORKS_FOLDER_PATH}/Flutter.framework",
 				"${TARGET_BUILD_DIR}/${FRAMEWORKS_FOLDER_PATH}/flutter_des.framework",

example/pubspec.lock

@@ -7,7 +7,7 @@ packages:
       name: async
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "2.0.8"
+    version: "2.1.0"
   boolean_selector:
     dependency: transitive
     description:
@@ -59,7 +59,7 @@ packages:
       name: matcher
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "0.12.3+1"
+    version: "0.12.5"
   meta:
     dependency: transitive
     description:
@@ -80,14 +80,14 @@ packages:
       name: pedantic
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.4.0"
+    version: "1.5.0"
   quiver:
     dependency: transitive
     description:
       name: quiver
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "2.0.1"
+    version: "2.0.2"
   sky_engine:
     dependency: transitive
     description: flutter
@@ -99,7 +99,7 @@ packages:
       name: source_span
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.5.4"
+    version: "1.5.5"
   stack_trace:
     dependency: transitive
     description:
@@ -113,7 +113,7 @@ packages:
       name: stream_channel
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.6.8"
+    version: "2.0.0"
   string_scanner:
     dependency: transitive
     description:
@@ -134,7 +134,7 @@ packages:
       name: test_api
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "0.2.2"
+    version: "0.2.4"
   typed_data:
     dependency: transitive
     description:
@@ -150,4 +150,4 @@ packages:
     source: hosted
     version: "2.0.8"
 sdks:
-  dart: ">=2.1.0 <3.0.0"
+  dart: ">=2.2.0 <3.0.0"

example/test/widget_test.dart

@@ -5,9 +5,6 @@
 // gestures. You can also use WidgetTester to find child widgets in the widget
 // tree, read text, and verify that the values of widget properties are correct.
 
-import 'package:flutter/material.dart';
-import 'package:flutter_test/flutter_test.dart';
-
 void main() {
 
 }