Fix broken link to style article in README.
diff --git a/README.md b/README.md
index 0594b6e..be571e2 100644
--- a/README.md
+++ b/README.md
@@ -3,7 +3,7 @@
best formatting for it. Resulting code should follow the [Dart style guide][]
but, moreso, should look nice to most human readers, most of the time.
-[dart style guide]: https://www.dartlang.org/articles/style-guide/
+[dart style guide]: https://www.dartlang.org/guides/language/effective-dart/style
The formatter handles indentation, inline whitespace and
(by far the most difficult), intelligent line wrapping.
