fix: header casing

packages/stream_chat/lib/src/client.dart

@@ -350,7 +350,7 @@ class StreamChatClient {
   Map<String, String> get _httpHeaders => {
         'Authorization': token,
         'stream-auth-type': _authType,
-        'x-stream-client': _userAgent,
+        'X-Stream-Client': _userAgent,
         'Content-Encoding': 'gzip',
       };
 
@@ -468,9 +468,9 @@ class StreamChatClient {
       user: state.user,
       connectParams: {
         'api_key': apiKey,
-        'authorization': token,
+        'Authorization': token,
         'stream-auth-type': _authType,
-        'x-stream-client': _userAgent,
+        'X-Stream-Client': _userAgent,
       },
       connectPayload: {
         'user_id': state.user.id,

packages/stream_chat/lib/version.dart

@@ -1,5 +1,5 @@
 import 'package:stream_chat/src/client.dart';
 
 /// Current package version
-/// Used in [StreamChatClient] to build the `x-stream-client` header
+/// Used in [StreamChatClient] to build the `X-Stream-Client` header
 const PACKAGE_VERSION = '1.3.1-beta';