relax dependency requirement for platform (#9)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5871f74..93d7fa2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,6 @@
+### 2.0.3
+* relax dependency requirement for `platform`
+
 #### 2.0.2
 
 * Fix a strong mode function expression return type inference bug with Dart
diff --git a/pubspec.yaml b/pubspec.yaml
index fb8ecb3..d565ac4 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,5 +1,5 @@
 name: process
-version: 2.0.2
+version: 2.0.3
 authors:
 - Todd Volkert <tvolkert@google.com>
 - Michael Goderbauer <goderbauer@google.com>
@@ -11,7 +11,7 @@
   intl: '>=0.14.0 <0.15.0'
   meta: ^1.0.4
   path: ^1.4.0
-  platform: ^1.0.1
+  platform: '>=1.0.1 <3.0.0'
 
 dev_dependencies:
   test: ^0.12.10