Update readme to say browsers are not supported yet.

R=mit@google.com

Review URL: https://codereview.chromium.org//1616973003 .
diff --git a/README.md b/README.md
index 24e0287..b5f5d74 100644
--- a/README.md
+++ b/README.md
@@ -4,6 +4,9 @@
 
 ## Features and bugs
 
+The current version depends on the `dart:io` library, and doesn't work
+in the browser. A browser alternative will be added soon.
+
 Please file feature requests and bugs at the [issue tracker][tracker].
 
 [tracker]: https://github.com/dart-lang/resource/issues
diff --git a/pubspec.yaml b/pubspec.yaml
index 1ed854a..d4734e4 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,5 +1,5 @@
 name: resource
-version: 1.0.0
+version: 1.0.1
 description: Reading resource data from (package and other) files.
 author: Dart Team <misc@dartlang.org>
 homepage: https://github.com/dart-lang/resource