update flutter_markdown

Author: CarGuo

pubspec.lock

@@ -255,7 +255,7 @@ packages:
       name: flutter_markdown
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "0.3.3"
+    version: "0.3.5"
   flutter_redux:
     dependency: "direct main"
     description:

pubspec.yaml

@@ -35,7 +35,7 @@ dependencies:
   json_annotation: 3.0.1
   package_info: 0.4.0+13
   connectivity: 0.4.6+1
-  flutter_markdown: 0.3.3
+  flutter_markdown: 0.3.5
   rxdart: 0.22.3
   device_info: 0.4.1+4
   url_launcher: 5.4.1