title: Update packages in R Shiny
body: <p>I have an R Shiny app I've had zero problems with for about a year now. Suddenly it isn't working ("disconnected from server"), and I discovered that the issue seems to be one of the packages (<code>rdrop2</code>) the app depends on was recently updated. When i run the app off my desktop after reinstalling rdrop2 the app runs fine. </p>
  
  <p>Is there a way to have R Shiny install the latest version of a package? I tried including <code>install.packages("rdrop2")</code> in my code but to no avail.</p>