gnu: r-dt: Update to 0.4.

* gnu/packages/statistics.scm (r-dt): Update to 0.4.
[propagated-inputs]: Add r-crosstalk.

gnu/packages/statistics.scm

@@ -3023,18 +3023,19 @@ using the multicore functionality of the parallel package.")
 (define-public r-dt
   (package
     (name "r-dt")
-    (version "0.2")
+    (version "0.4")
     (source (origin
               (method url-fetch)
               (uri (cran-uri "DT" version))
               (sha256
                (base32
-                "1g86p0jcjqi2ph5rhm45jkzibsa6yfcj8n5cg3giy90sqgjzkdx1"))))
+                "06gsqz7p2fv6hc3fm3759gaa50krcfrqrmy7qbxyam6a36w9daix"))))
     (properties
      `((upstream-name . "DT")))
     (build-system r-build-system)
     (propagated-inputs
-     `(("r-htmltools" ,r-htmltools)
+     `(("r-crosstalk" ,r-crosstalk)
+       ("r-htmltools" ,r-htmltools)
        ("r-htmlwidgets" ,r-htmlwidgets)
        ("r-magrittr" ,r-magrittr)))
     (home-page "http://rstudio.github.io/DT")