gnu: r-dt: Update to 0.20.

* gnu/packages/statistics.scm (r-dt): Update to 0.20.

gnu/packages/statistics.scm

@@ -3498,13 +3498,13 @@ using the multicore functionality of the parallel package.")
             "datatables-extensions/Select"))))
     (package
       (name "r-dt")
-      (version "0.19")
+      (version "0.20")
       (source (origin
                 (method url-fetch)
                 (uri (cran-uri "DT" version))
                 (sha256
                  (base32
-                  "04rv1rprqlc56hycxpqkbmwmq4wjvmanq2lwxrflmf2s46pbv9ms"))
+                  "17xs18i439p15agyk7z2xyyrwgrpn5pw09kd3jwxn7qhxi4pyvf6"))
                 (modules '((guix build utils)))
                 (snippet
                  '(for-each delete-file