build: upgrade flutter_markdown

lib/widgets/markdown_view.dart

@@ -116,11 +116,11 @@ class MarkdownView extends StatelessWidget {
         img: _basicStyle,
         blockSpacing: 16,
         listIndent: 32,
-        blockquotePadding: 16, // FIXME: only horizontal
+        blockquotePadding: EdgeInsets.symmetric(horizontal: 16),
         blockquoteDecoration: BoxDecoration(
           border: Border(left: BorderSide(color: Color(0xffdfe2e5), width: 4)),
         ),
-        codeblockPadding: 16,
+        codeblockPadding: EdgeInsets.all(16),
         codeblockDecoration: BoxDecoration(
           color: PrimerColors.gray100,
           borderRadius: BorderRadius.circular(3),

pubspec.yaml

@@ -25,7 +25,7 @@ dependencies:
   intl: ^0.16.0
   url_launcher: ^5.0.2
   uni_links: ^0.1.4
-  flutter_markdown: ^0.2.0
+  flutter_markdown: ^0.3.0
   shared_preferences: ^0.5.0
   share: ^0.6.0
   flutter_svg: ^0.13.0