[Feature/Add_Relative_Locators] Add private constructor for RelativeBySupplier class

Author: aPavar

src/main/java/aquality/selenium/locators/RelativeBySupplier.java

@@ -3,6 +3,10 @@
 import org.openqa.selenium.By;
 
 public class RelativeBySupplier {
+
+    private RelativeBySupplier() {
+    }
+
     public static RelativeBy with(By by) {
         return new RelativeBy(by);
     }