Replace vaadin dependency with vaadin-core

Author: javier-godoy

pom.xml

@@ -77,8 +77,7 @@
     <dependencies>
         <dependency>
             <groupId>com.vaadin</groupId>
-            <!-- Replace artifactId with vaadin-core to use only free components -->
-            <artifactId>vaadin</artifactId>
+            <artifactId>vaadin-core</artifactId>
             <exclusions>
                 <!-- Webjars are only needed when running in Vaadin 13 compatibility mode in V14.
                      Your add-on can support npm in the same version mode and V13 compatiblity mode at the same time,