Update README.md (#2688)

Fixes https://github.com/dart-lang/pub/issues/2649
diff --git a/README.md b/README.md
index f702625..e3e6137 100644
--- a/README.md
+++ b/README.md
@@ -12,12 +12,10 @@
 
 The first step towards contributing is to contact the pub dev team and let us
 know what you're working on, so we can be sure not to start working on the same
-thing at the same time. Just send an email to [misc@dartlang.org] letting us
-know that you're interested in contributing and what you plan on working on.
+thing at the same time. Open an [issue](http://github.com/dart-lang/pub/issues/new)
+letting us know that you're interested in contributing and what you plan on working on.
 This will also let us give you specific advice about where to start.
 
-[misc@dartlang.org]: mailto:misc@dartlang.org
-
 ## Organization
 
 Pub isn't a package, but it's organized like one. It has four top-level
@@ -74,4 +72,4 @@
 review before they're submitted. The full process for putting up your patch for
 review is [documented elsewhere][contributing].
 
-[contributing]: https://github.com/dart-lang/sdk/wiki/Contributing
+[contributing]: https://github.com/dart-lang/sdk/blob/master/CONTRIBUTING.md