title: JIRA expand = changelog not working
body: <p>I'm trying to query jira for data with folowing jql:</p>
  
  <pre><code> $jql_options = array(
          "jql" =&gt; $jql,
          "startAt" =&gt; 0,
          "maxResults" =&gt; 1,
          "validateQuery" =&gt; false,
          "fields" =&gt; array(
              "summary",
              "status",
              "assignee"
          ),
          "expand" =&gt; "changelog"
      );
  </code></pre>
  
  <p>And i get this error: </p>
  
  <pre><code>string(282) "{"errorMessages":["Can not deserialize instance of java.util.ArrayList out of VALUE_STRING token\n at [Source: org.apache.catalina.connector.CoyoteInputStream@464d8928; line: 1, column: 2] (through reference chain: com.atlassian.jira.rest.v2.search.SearchRequestBean[\"expand\"])"]}"
  </code></pre>
  
  <p>I understand it's an error with "expand" => "changelog" but on their site they present an requeste representation like mine.</p>
  
  <p>Can u give me some advice? :)</p>