Resolve "Angabe im README nicht korrekt"

Korrigiert die README zur Ausführung von Build und Tests

README.md

@@ -61,7 +61,7 @@ _The following steps show how to get the SDK running_
    ```
 4. Build the project
    ```sh
-   mvn clean install
+   mvn clean install -DskipTests
    ```
 5. Enter your API keys and references to your private decryption key in `config.yml`