title: I cant find package tools in cran and github
body: <p>I need to include package
  <code>tools</code> on my shiny app. but I can't find the package in cran nor GitHub, where exactly is it housed. it is already installed on my R but I suspect it was installed as a dependency.</p>
  <p>it is the library discussed here
  <a href="https://stackoverflow.com/a/47115540">https://stackoverflow.com/a/47115540</a></p>