Update README.md (epam-cross-platform-lab#262)

README.md

@@ -28,19 +28,21 @@ In general case for each .swagger file three outputs will be created. </br>
 <img src="https://raw.githubusercontent.com/epam-cross-platform-lab/swagger-dart-code-generator/master/assets/overview_image.png" width="320" alt="Bloc" />
 
 ## **Installation**
+The generated code uses the following packages in run-time:
+```yaml
+dependencies:
+  chopper: ^4.0.1
+  json_annotation: ^4.1.0
+```
+
 Add the following to your `pubspec.yaml` file to be able to do code generation:
 ```yaml
 dev_dependencies:
+  build_runner: ^2.1.4
   chopper_generator: ^4.0.2
   json_serializable: ^5.0.0
   swagger_dart_code_generator: any
 ```
-The generated code uses the following packages in run-time:
-```yaml
-dependencies:
-  chopper: ^4.0.1
-  json_annotation: ^4.1.0
-```
 
 Then run:
 ```shell