Fix a bug where BrowserClient was listed as requiring Flutter (#1077)

Author: brianquinlan

pkgs/http/README.md

@@ -124,7 +124,7 @@ Some well supported implementations are:
 | Implementation | Supported Platforms | SDK | Caching | HTTP3/QUIC | Platform Native | 
 | -------------- | ------------------- | ----| ------- | ---------- | --------------- |
 | `package:http` — [`IOClient`][ioclient] | Android, iOS, Linux, macOS, Windows | Dart, Flutter | ❌ | ❌ | ❌ |
-| `package:http` — [`BrowserClient`][browserclient] | Web | Flutter | ― | ✅︎ | ✅︎ | Dart, Flutter |
+| `package:http` — [`BrowserClient`][browserclient] | Web | Dart, Flutter | ― | ✅︎ | ✅︎ | Dart, Flutter |
 | [`package:cupertino_http`][cupertinohttp] — [`CupertinoClient`][cupertinoclient] | iOS, macOS | Flutter | ✅︎ | ✅︎ | ✅︎ |
 | [`package:cronet_http`][cronethttp] — [`CronetClient`][cronetclient] | Android | Flutter | ✅︎ | ✅︎ | ― |
 | [`package:fetch_client`][fetch] — [`FetchClient`][fetchclient] | Web | Dart, Flutter | ✅︎ | ✅︎ | ✅︎ |