matcher: fixed status file, formatting, tweaks to readme

lib/src/interfaces.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library matcher.interfaces;
 
 // To decouple the reporting of errors, and allow for extensibility of
 // matchers, we make use of some interfaces.
 
 /// Matchers build up their error messages by appending to
@@ skipping 36 matching lines @@
   Description describe(Description description);
 
   /// This builds a textual description of a specific mismatch. [item]
   /// is the value that was tested by [matches]; [matchState] is
   /// the [Map] that was passed to and supplemented by [matches]
   /// with additional information about the mismatch, and [mismatchDescription]
   /// is the [Description] that is being built to decribe the mismatch.
   /// A few matchers make use of the [verbose] flag to provide detailed
   /// information that is not typically included but can be of help in
   /// diagnosing failures, such as stack traces.
-  Description describeMismatch(item, Description mismatchDescription,
-      Map matchState, bool verbose) => mismatchDescription;
+  Description describeMismatch(
+      item, Description mismatchDescription, Map matchState, bool verbose) =>
+      mismatchDescription;
 }