messageItem() with timestamp produces warning

[sam]

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