title: How to check which version of R a package supports
body: <p>I have tried to install the R package swiRcharts and received the following message: </p>
  
  <blockquote>
    <p>package ‘swiRcharts’ is not available (for R version 3.3.1)</p>
  </blockquote>
  
  <p>Where in the package files (available on GitHub) on from R console can I check which version of R the package was made for? </p>