Declare support for async 2.0.0 (dart-lang/test_process#6)

pkgs/test_process/CHANGELOG.md

diff --git a/pkgs/test_process/CHANGELOG.md b/pkgs/test_process/CHANGELOG.md
index 429bb5c..3539933 100644
--- a/pkgs/test_process/CHANGELOG.md
+++ b/pkgs/test_process/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 1.0.1
+
+* Declare support for `async` 2.0.0.
+
 ## 1.0.0
 
 * Added `pid` and `exitCode` getters to `TestProcess`.

pkgs/test_process/pubspec.yaml

diff --git a/pkgs/test_process/pubspec.yaml b/pkgs/test_process/pubspec.yaml
index 88d6678..8f96bbc 100644
--- a/pkgs/test_process/pubspec.yaml
+++ b/pkgs/test_process/pubspec.yaml
@@ -1,5 +1,5 @@
 name: test_process
-version: 1.0.0
+version: 1.0.1
 description: A package for testing subprocesses.
 author: Dart Team <misc@dartlang.org>
 homepage: https://github.com/dart-lang/test_process
@@ -8,7 +8,7 @@
   sdk: '>=1.8.0 <2.0.0'
 
 dependencies:
-  async: "^1.12.0"
+  async: ">=1.12.0 <3.0.0"
   meta: ">=0.9.0 <2.0.0"
   path: "^1.0.0"
   test: "^0.12.19"