title: JHipster :Removing a field from an entity: Liquibase does not remove the field from the database : Validation failed error
body: <p>So I have a Jhipster entity that I am removing a field from using the command "Jhipster entity Model" for an entity I already have called Model
  . It removes the field from the front end and java code, but the column is still in the database(h2 disk based) along with the data for each row in that field.</p>
  
  <p>I get this error on startup of the spring app  </p>
  
  <pre><code> 1 change sets check sum
        config/liquibase/changelog/20190411130704_added_entity_Model.xml::20190411130704-1::jhipster was: 7:03313fa12946fa4bb3e16f838f8dc4d7 but is now: 7:aed492b04b5a800b82655ff2eabd0f65
  
  
   liquibase.exception.ValidationFailedException: Validation Failed:
   1 change sets check sum
       config/liquibase/changelog/20190411130704_added_entity_Model.xml::20190411130704-1::jhipster was: 7:03313fa12946fa4bb3e16f838f8dc4d7 but is now: 7:aed492b04b5a800b82655ff2eabd0f65
  </code></pre>