title: Interactive plotting of a subset of a dataframe
body: <p>I have a dataframe of the number of vaccinations per country and per vaccine (here is only an extract, there is about 30 countries in the full dataset).</p>
  <pre><code>Country    Vaccines  Total vaccinations
  Austria      Pfizer               65000
  Austria     Moderna               56000
  Austria  Astrazenca                9000
      USA      Pfizer              110000
      USA     Moderna               90000
      USA          JJ               46000
    India     Covaxin              312000
    India  Covishield              256000
  Germany      Pfizer               36000
  Germany     Moderna               22000
  Germany     Covaxin                7000
  Germany  Astrazenca               14500
  </code></pre>
  <p>I would like to generate a bar plot of the number of vaccinations per vaccine for a given country. I would like the plot to be interactive by selecting the country with a drop down menu.</p>