title: R-package development using travis CI gets error due to failing to install dependency package
body: <p>In RStudio, I'm using <code>usethis::use_travis()</code> and TRAVIS CI with Github. However, my package cannot build because <code>yardstick</code> 0.0.7 cannot build.</p>
  <p>Note that my package can build locally with both <code>rcmdcheck()</code> and <code>devtools::check()</code>; and my package is not directly dependent on <code>yardstick</code>, but it is rather a dependency of a dependency: so I cannot just make my package dependent on an earlier more stable version of <code>yardstick</code>.</p>
  <p>I am stuck not knowing how to continue!</p>
  <p>Is it perhaps possible to specify, for example in the .travis.yml file, a specific version for <code>yardstick</code> (even though it is a dependency of a dependency)?</p>
  <p>(According to the yardstick website the package fail to build <a href="https://yardstick.tidymodels.org/" rel="nofollow noreferrer">https://yardstick.tidymodels.org/</a> ; and it looks like it's been this way for 5 months; <a href="https://travis-ci.org/github/tidymodels/yardstick" rel="nofollow noreferrer">https://travis-ci.org/github/tidymodels/yardstick</a>).</p>
  <p>Any help is much appreciated!
  John</p>