updated project style guidelines

lib/api/webuntis/queries/getRooms/getRooms.dart

@@ -9,7 +9,7 @@ class GetRooms extends WebuntisApi {
 
   @override
   Future<GetRoomsResponse> run() async {
-    String rawAnswer = await query(this);
+    var rawAnswer = await query(this);
     try {
       return finalize(GetRoomsResponse.fromJson(jsonDecode(rawAnswer)));
     } catch(e, trace) {
@@ -20,4 +20,4 @@ class GetRooms extends WebuntisApi {
     throw Exception('Failed to parse getRoom server response: $rawAnswer');
   }
 
-}
+}

lib/api/webuntis/queries/getRooms/getRoomsCache.dart

@@ -10,13 +10,9 @@ class GetRoomsCache extends RequestCache<GetRoomsResponse> {
   }
 
   @override
-  Future<GetRoomsResponse> onLoad() {
-    return GetRooms().run();
-  }
+  Future<GetRoomsResponse> onLoad() => GetRooms().run();
 
   @override
-  GetRoomsResponse onLocalData(String json) {
-    return GetRoomsResponse.fromJson(jsonDecode(json));
-  }
+  GetRoomsResponse onLocalData(String json) => GetRoomsResponse.fromJson(jsonDecode(json));
 
-}
+}

lib/api/webuntis/queries/getRooms/getRoomsResponse.dart

@@ -26,4 +26,4 @@ class GetRoomsResponseObject {
 
   factory GetRoomsResponseObject.fromJson(Map<String, dynamic> json) => _$GetRoomsResponseObjectFromJson(json);
   Map<String, dynamic> toJson() => _$GetRoomsResponseObjectToJson(this);
-}
+}