messageItem() with timestamp produces warning

[samssann]

Function messageItem() uses shiny::icon("clock-o") which produces a warning for non-existent icons in the new shiny >= 1.7.0 and fontawesome framework. There are two easy options to fix this:

1. add verify_fa = FALSE argument to shiny::icon()
2. use shiny::icon("clock") or fontawesome::fa("clock")

   > shinydashboard::messageItem
   function (from, message, icon = shiny::icon("user"), time = NULL, 
   href = NULL) 
   {
   tagAssert(icon, type = "i")
   if (is.null(href)) 
       href <- "#"
   tags$li(a(href = href, icon, h4(from, if (!is.null(time)) 
       tags$small(shiny::icon("clock-o"), time)), p(message)))
   }
   > shiny::icon("clock-o")
   This Font Awesome icon ('clock-o') does not exist:
   * if providing a custom `html_dependency` these `name` checks can 
   be deactivated with `verify_fa = FALSE`

   Package information shinydashboard 0.7.2 shiny 1.7.1 fontawesome 0.2.2