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Filter using ParDo
------------------

**Kata:** Implement a filter function that filters out the even numbers by using 
[DoFn](https://beam.apache.org/releases/javadoc/current/org/apache/beam/sdk/transforms/DoFn.html).

<div class="hint">
  Use <a href="https://beam.apache.org/releases/javadoc/current/org/apache/beam/sdk/transforms/ParDo.html">
  ParDo</a> with
  <a href="https://beam.apache.org/releases/javadoc/current/org/apache/beam/sdk/transforms/DoFn.html">
    DoFn</a> and only output the intended element.
</div>
