update version number

Author: TorstenDittmann

README.md

@@ -22,7 +22,7 @@ Add this to your package's `pubspec.yaml` file:
 
 ```yml
 dependencies:
-  appwrite: ^0.6.3
+  appwrite: ^0.6.4
 ```
 
 You can install packages from the command line:

lib/client.dart

@@ -26,7 +26,7 @@ class Client {
 
         this.headers = {
             'content-type': 'application/json',
-            'x-sdk-version': 'appwrite:flutter:0.6.3',
+            'x-sdk-version': 'appwrite:flutter:0.6.4',
             'X-Appwrite-Response-Format' : '0.8.0',
         };
 

pubspec.yaml

@@ -1,5 +1,5 @@
 name: appwrite
-version: 0.6.3
+version: 0.6.4
 description: Appwrite is an open-source self-hosted backend server that abstract and simplify complex and repetitive development tasks behind a very simple REST API
 homepage: https://appwrite.io
 repository: https://github.com/appwrite/sdk-for-flutter