Allow a range on package:web

Author: ditman

packages/google_identity_services_web/pubspec.yaml

@@ -9,7 +9,7 @@ environment:
 
 dependencies:
   meta: ^1.3.0
-  web: ^1.0.0
+  web: ">=0.5.0 <2.0.0"
 
 dev_dependencies:
   path: ^1.8.1