Remove redundant const from README (#1434)

diff --git a/pkgs/test/CHANGELOG.md b/pkgs/test/CHANGELOG.md
index 67a84fb..fc3b6a2 100644
--- a/pkgs/test/CHANGELOG.md
+++ b/pkgs/test/CHANGELOG.md
@@ -1,3 +1,5 @@
+## 1.16.3-dev
+
 ## 1.16.2
 
 * Update `test_core` dependency to `0.3.13`.
diff --git a/pkgs/test/README.md b/pkgs/test/README.md
index 87cf5c3..399dac5 100644
--- a/pkgs/test/README.md
+++ b/pkgs/test/README.md
@@ -636,7 +636,7 @@
 timeout for a test suite, put a `@Timeout` annotation at the top of the file:
 
 ```dart
-@Timeout(const Duration(seconds: 45))
+@Timeout(Duration(seconds: 45))
 
 import 'package:test/test.dart';
 
@@ -679,9 +679,9 @@
 and `group()`. For example:
 
 ```dart
-@OnPlatform(const {
+@OnPlatform({
   // Give Windows some extra wiggle-room before timing out.
-  'windows': const Timeout.factor(2)
+  'windows': Timeout.factor(2)
 })
 
 import 'package:test/test.dart';
@@ -721,7 +721,7 @@
 parameter to `test()` and `group()`. For example:
 
 ```dart
-@Tags(const ['browser'])
+@Tags(['browser'])
 
 import 'package:test/test.dart';
 
diff --git a/pkgs/test/pubspec.yaml b/pkgs/test/pubspec.yaml
index de822df..c419346 100644
--- a/pkgs/test/pubspec.yaml
+++ b/pkgs/test/pubspec.yaml
@@ -1,5 +1,5 @@
 name: test
-version: 1.16.2
+version: 1.16.3-dev
 description: A full featured library for writing and running Dart tests.
 homepage: https://github.com/dart-lang/test/blob/master/pkgs/test