title: lubridate: how to parse month-year?
body: <p>I have a column of dates as follows,</p>
  
  <pre><code>&gt; mymonth = c('10/2015','11/2016','12/2016')
  &gt; data &lt;- data_frame(mymonth)
  &gt; data
  # A tibble: 3 × 1
    mymonth
      &lt;chr&gt;
  1 10/2015
  2 11/2016
  3 12/2016
  </code></pre>
  
  <p>Here, obviously, my month corresponds to a particular month in the year. October 2015, November 2015 and December 2015.</p>
  
  <p>I cannot parse these dates correctly with <code>lubridate</code>. It is assumed the month correspond to the last business day of the month.</p>
  
  <p>How can I have this variable translated into a <code>date</code> variable that <code>lubridate</code> understands?</p>
  
  <p>Thanks~</p>