Fixxed the readme, removed useless dependency and added @throws for javadoc

src/main/java/licenselib/LicenseClient.java

@@ -23,6 +23,7 @@ public class LicenseClient {
 
     /**
      * Private constructor to prevent instantiation of this utility class.
+     * @throws UnsupportedOperationException always thrown to indicate that this class should not be instantiated.
      */
     private LicenseClient() {
         throw new UnsupportedOperationException("Utility class");