title: Liquibase modifysql tag with sql tag in same changeset not working
body: <blockquote>
    <p>liquibase: cvc-complex-type.2.4.a: Invalid content was found starting
    with element 'sql'. One of
    '{"<a href="http://www.liquibase.org/xml/ns/dbchangelog" rel="nofollow noreferrer">http://www.liquibase.org/xml/ns/dbchangelog</a>":modifySql}' is
    expected.</p>
  </blockquote>
  
  <p>Getting an error for this changeset</p>
  
  <pre><code>&lt;changeSet id="18.7.0.1-1-userTable" author="so"&gt;
      &lt;preConditions onFail="MARK_RAN"&gt;
          &lt;not&gt;
              &lt;tableExists tableName="USER_CURRENT"/&gt;
          &lt;/not&gt;
      &lt;/preConditions&gt;
      &lt;createTable tableName="USER_CURRENT"&gt;
          &lt;column name="name" type="VARCHAR(20)"&gt;
              &lt;constraints primaryKey="true" nullable="false" primaryKeyName="name"/&gt;
          &lt;/column&gt;
  
      &lt;/createTable&gt;
      &lt;modifySql dbms="mysql"&gt;
          &lt;append value=" PARTITION BY KEY() PARTITIONS 16"/&gt;
      &lt;/modifySql&gt;
      &lt;modifySql dbms="oracle"&gt;
          &lt;append value=" ORGANIZATION INDEX PARTITION BY HASH (name) PARTITIONS 16 PARALLEL 4"/&gt;
      &lt;/modifySql&gt;
      &lt;sql&gt;GRANT SELECT ON USER_CURRENT TO 'reportsUser'@'%';&lt;/sql&gt;       
  &lt;/changeSet&gt;
  </code></pre>