Fix typo in previous roll.

It is fixed by doing another roll, which produced difference in that one character.

BUG=
R=rmacnak@google.com

Review-Url: https://codereview.chromium.org//3014643002 .
diff --git a/packages/charcode/lib/charcode.dart b/packages/charcode/lib/charcode.dart
index 67f30b3..6a702d7 100644
--- a/packages/charcode/lib/charcode.dart
+++ b/packages/charcode/lib/charcode.dart
@@ -14,4 +14,4 @@
 library charcode;
 
 export "ascii.dart";
-export "html_entity4.dart" hide $minus, $tilde, $sub;
+export "html_entity.dart" hide $minus, $tilde, $sub;