add flutter_lints

flutter/pubspec.lock

@@ -49,7 +49,7 @@ packages:
       name: async
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "2.9.0"
+    version: "2.8.2"
   back_button_interceptor:
     dependency: "direct main"
     description:
@@ -147,7 +147,7 @@ packages:
       name: characters
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.2.1"
+    version: "1.2.0"
   charcode:
     dependency: transitive
     description:
@@ -168,7 +168,7 @@ packages:
       name: clock
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.1.1"
+    version: "1.1.0"
   code_builder:
     dependency: transitive
     description:
@@ -326,7 +326,7 @@ packages:
       name: fake_async
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.3.1"
+    version: "1.3.0"
   ffi:
     dependency: "direct main"
     description:
@@ -423,6 +423,13 @@ packages:
       url: "https://pub.flutter-io.cn"
     source: hosted
     version: "0.9.3"
+  flutter_lints:
+    dependency: "direct dev"
+    description:
+      name: flutter_lints
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "2.0.1"
   flutter_parsed_text:
     dependency: transitive
     description:
@@ -596,6 +603,13 @@ packages:
       url: "https://pub.flutter-io.cn"
     source: hosted
     version: "4.6.0"
+  lints:
+    dependency: transitive
+    description:
+      name: lints
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "2.0.0"
   logging:
     dependency: transitive
     description:
@@ -609,14 +623,14 @@ packages:
       name: matcher
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "0.12.12"
+    version: "0.12.11"
   material_color_utilities:
     dependency: transitive
     description:
       name: material_color_utilities
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "0.1.5"
+    version: "0.1.4"
   menu_base:
     dependency: transitive
     description:
@@ -630,7 +644,7 @@ packages:
       name: meta
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.8.0"
+    version: "1.7.0"
   mime:
     dependency: transitive
     description:
@@ -707,7 +721,7 @@ packages:
       name: path
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.8.2"
+    version: "1.8.1"
   path_provider:
     dependency: "direct main"
     description:
@@ -957,7 +971,7 @@ packages:
       name: source_span
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.9.0"
+    version: "1.8.2"
   sqflite:
     dependency: transitive
     description:
@@ -999,7 +1013,7 @@ packages:
       name: string_scanner
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.1.1"
+    version: "1.1.0"
   synchronized:
     dependency: transitive
     description:
@@ -1013,14 +1027,14 @@ packages:
       name: term_glyph
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.2.1"
+    version: "1.2.0"
   test_api:
     dependency: transitive
     description:
       name: test_api
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "0.4.12"
+    version: "0.4.9"
   timing:
     dependency: transitive
     description: