title: Rename Dataframe column names julia v1.0
body: <p>In 0.6 I was using: </p>
  
  <pre><code>colnames = ["Date_Time","Date_index","Time_index"]
  names!(data1_date_time_index.colindex, map(parse, colnames))
  </code></pre>
  
  <p>What is the syntax for v1.0 - right now .colindex is not found. </p>
  
  <p>Per DataFrames docs: </p>
  
  <pre><code>rename!(data1_date_time_index, f =&gt; t for (f, t) =
     zip([:x1, :x1_1, :x1_2],     
         [:Date_Time, :Date_index, :Time_index]))
  </code></pre>