Update lower SDK bound to 2.2.0 (dart-lang/browser_launcher#15)

pkgs/browser_launcher/.travis.yml

diff --git a/pkgs/browser_launcher/.travis.yml b/pkgs/browser_launcher/.travis.yml
index 5fa4a53..b4e1991 100644
--- a/pkgs/browser_launcher/.travis.yml
+++ b/pkgs/browser_launcher/.travis.yml
@@ -1,7 +1,7 @@
 language: dart
 
 dart:
-  - 2.1.2-dev.0.0
+  - 2.2.0
   - dev
 
 dart_task:

pkgs/browser_launcher/CHANGELOG.md

diff --git a/pkgs/browser_launcher/CHANGELOG.md b/pkgs/browser_launcher/CHANGELOG.md
index 4a1b460..e9d9fb5 100644
--- a/pkgs/browser_launcher/CHANGELOG.md
+++ b/pkgs/browser_launcher/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 0.1.6-dev
+
+- Update lower Dart SDK requirement to 2.2.0.
+
 ## 0.1.5
 
 - Add a parameter to use a specified user-data-dir instead of a system temp.

pkgs/browser_launcher/pubspec.yaml

diff --git a/pkgs/browser_launcher/pubspec.yaml b/pkgs/browser_launcher/pubspec.yaml
index 59c3d46..7c614c8 100644
--- a/pkgs/browser_launcher/pubspec.yaml
+++ b/pkgs/browser_launcher/pubspec.yaml
@@ -1,13 +1,13 @@
 name: browser_launcher
 description: Provides a standardized way to launch web browsers for testing and tools.
 
-version: 0.1.5
+version: 0.1.6-dev
 
 author: Dart Team <misc@dartlang.org>
 homepage: https://github.com/dart-lang/browser_launcher
 
 environment:
-  sdk: '>=2.1.2-dev.0.0 <3.0.0'
+  sdk: '>=2.2.0 <3.0.0'
 
 dependencies:
   path: ^1.6.2