fix: add query builder

Author: TorstenDittmann

README.md

@@ -31,7 +31,7 @@ Add the package to your `Package.swift` dependencies:
 
 ```swift
     dependencies: [
-        .package(url: "[email protected]:appwrite/sdk-for-apple.git", from: "0.2.0"),
+        .package(url: "[email protected]:appwrite/sdk-for-apple.git", from: "0.2.1"),
     ],
 ```
 

Sources/Appwrite/Client.swift

@@ -19,7 +19,7 @@ open class Client {
 
     open var headers: [String: String] = [
         "content-type": "",
-        "x-sdk-version": "appwrite:swiftclient:0.2.0",        "X-Appwrite-Response-Format": "0.12.0"
+        "x-sdk-version": "appwrite:swiftclient:0.2.1",        "X-Appwrite-Response-Format": "0.12.0"
     ]
 
     open var config: [String: String] = [:]