Updated docs to reflect that Response.change(body: null) will not work (#127)
diff --git a/lib/src/response.dart b/lib/src/response.dart
index 73b08e0..2fd3f1c 100644
--- a/lib/src/response.dart
+++ b/lib/src/response.dart
@@ -304,7 +304,7 @@
/// in the copied [Response] unchanged.
///
/// [body] is the request body. It may be either a [String], a [List<int>], a
- /// [Stream<List<int>>], or `null` to indicate no body.
+ /// [Stream<List<int>>], or `<int>[]` (empty list) to indicate no body.
@override
Response change(
{Map<String, String> headers, Map<String, Object> context, body}) {
