update homepage and quiver dependency

Also increased the minimum required SDK
diff --git a/pubspec.yaml b/pubspec.yaml
index a992d3e..0eb79b5 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,19 +1,19 @@
 name: dart2js_info
-version: 0.5.4+1
+version: 0.5.5-dev
 description: >
   Libraries and tools to process data produced when running dart2js with
   --dump-info.
 author: Dart Team <misc@dartlang.org>
-homepage: http://dart-lang.github.io/dart2js_info/doc/api/
+homepage: https://github.com/dart-lang/dart2js_info/
 
 environment:
-  sdk: '>=1.11.0 <2.0.0'
+  sdk: '>=1.21.1 <2.0.0'
 dependencies:
   args: ^0.13.0
   charcode: ^1.1.0
   collection: ^1.10.1
   path: ^1.3.6
-  quiver: '>=0.21.0 <0.25.0'
+  quiver: '>=0.21.0 <0.26.0'
   shelf: ^0.6.1+2
   yaml: ^2.1.0
 dev_dependencies: