Merge pull request #168 from DoubleML/m-html-cran-issue

Patch for #167

Author: MalteKurz

DESCRIPTION

@@ -36,7 +36,7 @@ Imports:
     mlr3learners (>= 0.3.0),
     mlr3misc
 Roxygen: list(markdown = TRUE, r6 = TRUE)
-RoxygenNote: 7.1.1
+RoxygenNote: 7.2.1
 Suggests: 
     knitr,
     rmarkdown,