Move data.table from Depends to Imports (see Rdatatable/data.table#3076)

Author: teunbrand

DESCRIPTION

@@ -7,14 +7,14 @@ Authors@R: c(
   person("Elzo", "de Wit", email = "[email protected]", role = "aut"))
 Description: GENOVA consist of a set of analysis- and visualisation-functions. These will help to discover valuable information buried deep in your HiC-matrices.
 Depends:
-    R (>= 3.5.0),
-    data.table
+    R (>= 3.5.0)
 License: MIT + file LICENSE
 Encoding: UTF-8
 LazyData: true
 Imports: 
     ggplot2 (>= 3.3.0),
-    scales (>= 1.1.1)
+    scales (>= 1.1.1),
+    data.table
 RoxygenNote: 7.1.1
 Suggests: 
     knitr,

R/GENOVA.R

@@ -4,6 +4,20 @@
 #' @import utils graphics stats grDevices
 NULL
 
+# data.table is generally careful to minimize the scope for namespace
+# conflicts (i.e., functions with the same name as in other packages);
+# a more conservative approach using @importFrom should be careful to
+# import any needed data.table special symbols as well, e.g., if you
+# run DT[ , .N, by='grp'] in your package, you'll need to add
+# @importFrom data.table .N to prevent the NOTE from R CMD check.
+# See ?data.table::`special-symbols` for the list of such symbols
+# data.table defines; see the 'Importing data.table' vignette for more
+# advice (vignette('datatable-importing', 'data.table')).
+#
+#' @import data.table
+NULL
+
+
 utils::globalVariables(c('.',
                          LETTERS[1:5],
                          'colour',