completely remove xcolor from latex dependency
diff --git a/R/util.R b/R/util.R
index df04344..8c83003 100644
--- a/R/util.R
+++ b/R/util.R
@@ -110,8 +110,7 @@
     "\\usepackage[normalem]{ulem}",
     "\\usepackage[normalem]{ulem}",
     "\\usepackage[utf8]{inputenc}",
-    "\\usepackage{makecell}",
-    "\\usepackage{xcolor}"
+    "\\usepackage{makecell}"
   ))
 }