Updated markdown library.

third_party/pkg/markdown/lib/src/inline_parser.dart

Index: third_party/pkg/markdown/lib/src/inline_parser.dart
diff --git a/third_party/pkg/markdown/lib/src/inline_parser.dart b/third_party/pkg/markdown/lib/src/inline_parser.dart
index 6772c8416d95a16ca556b12ea2fc271223f56c4e..b46f5f956da1e4584c6894655e9d4e4399da5887 100644
--- a/third_party/pkg/markdown/lib/src/inline_parser.dart
+++ b/third_party/pkg/markdown/lib/src/inline_parser.dart
@@ -274,7 +274,7 @@ class LinkSyntax extends TagSyntax {
   LinkSyntax({this.linkResolver, String pattern: r'\['})
     : super(pattern, end: linkPattern);
 
-  Node createNode(InlineParser parser, Match match, TagState state) {
+  Element createNode(InlineParser parser, Match match, TagState state) {
     // If we didn't match refLink or inlineLink, then it means there was
     // nothing after the first square bracket, so it isn't a normal markdown
     // link at all. Instead, we allow users of the library to specify a special
@@ -334,7 +334,7 @@ class LinkSyntax extends TagSyntax {
   }
 
   bool onMatchEnd(InlineParser parser, Match match, TagState state) {
-    Node node = createNode(parser, match, state);
+    Element node = createNode(parser, match, state);
     if (node == null) return false;
     parser.addNode(node);
     return true;
@@ -348,8 +348,8 @@ class ImageLinkSyntax extends LinkSyntax {
   ImageLinkSyntax({this.linkResolver})
     : super(pattern: r'!\[');
 
-  Node createNode(InlineParser parser, Match match, TagState state) {
-    Node node = super.createNode(parser, match, state);
+  Element createNode(InlineParser parser, Match match, TagState state) {
+    Element node = super.createNode(parser, match, state);
     if (node == null) return null;
 
     final Element imageElement = new Element.withTag("img")