Update README.md (#5)

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 # http_io
 
-The HTTP APIs in `dart:io` are pure Dart code. To enable faster development and
-bug fixes, these APIS are moving out of `dart:io` into this package.
+[![Build Status](https://travis-ci.org/dart-lang/http_io.svg?branch=master)](https://travis-ci.org/dart-lang/http_io)
+
+The HTTP APIs in `dart:io` are pure Dart code not relying on native runtime
+calls. To enable faster development and bug fixes, these APIs are moving out of
+`dart:io` into this package.
+
+Watch the [dart-misc](https://groups.google.com/a/dartlang.org/forum/#!forum/misc)
+mailing list for news about deprecation and migration.