v.colors: add progress info message

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@47611 15284696-431f-4ddb-bdfa-cd5b030d7da7

vector/v.colors/scan_cats.c

@@ -15,6 +15,7 @@ void scan_cats(const struct Map_info *Map, int field, const char *style,
     *cmin = *cmax = -1;
     Cats = Vect_new_cats_struct();
 
+    G_message(_("Reading features..."));
     while(TRUE) {
 	ltype = Vect_read_next_line(Map, NULL, Cats);
 	if (ltype == -1)