v2: Link to relevant issues. (#317)

Author: emilio

README.md

@@ -3,13 +3,16 @@ rust-smallvec
 
 > **⚠️ Note:**
 > This is the code for smallvec 2.0, which is not yet ready for release.  For
-> details about the changes in version 2.0, please see #183, #240, and #284.
+> details about the changes in version 2.0, please see [#183], [#240], and [#284].
 >
 > The source code for the latest smallvec 1.x.y release can be found on the
 > [v1 branch].  Bug fixes for smallvec 1 should be based on that branch, while
 > new feature development should go on the v2 branch.
 
 [v1 branch]: https://github.com/servo/rust-smallvec/tree/v1
+[#183]: https://github.com/servo/rust-smallvec/issues/183
+[#240]: https://github.com/servo/rust-smallvec/issues/240
+[#284]: https://github.com/servo/rust-smallvec/issues/284
 
 ## About smallvec