pkg/unittest fix deprecation message for mock

pkg/unittest/CHANGELOG.md

-# Changelog - unittest
+##0.10.1+2
 
+* Fixed deprecation message for `mock`.
+
+##0.10.1+1
+
+* Fixed CHANGELOG
+* Moved to triple-slash for all doc comments.
+
 ##0.10.1
 
 * **DEPRECATED**
     * `matcher.dart` and `mirror_matchers.dart` are now in the `matcher`
       package.
     * `mock.dart` is now in the `mock` package.
 * `equals` now allows a nested matcher as an expected list element or map value
   when doing deep matching.
 * `expectAsync` and `expectAsyncUntil` now support up to 6 positional arguments
   and correctly handle functions with optional positional arguments with default
@@ skipping 13 matching lines @@
 * `TestCase`:
     * Removed properties: `setUp`, `tearDown`, `testFunction`
     * `enabled` is now get-only
     * Removed methods: `pass`, `fail`, `error`
 * `interactive_html_config.dart` has been removed.
 * `runTests`, `tearDown`, `setUp`, `test`, `group`, `solo_test`, and
   `solo_group` now throw a `StateError` if called while tests are running.
 * `rerunTests` has been removed.
 
 ##0.9.3 - 2014-01-13