gnu: r-roxygen2: Update to 7.0.0.

* gnu/packages/statistics.scm (r-roxygen2): Update to 7.0.0.
[propagated-inputs]: Add r-rlang.

gnu/packages/statistics.scm

@@ -2309,13 +2309,13 @@ tables, autolinks and strikethrough text.")
 (define-public r-roxygen2
   (package
     (name "r-roxygen2")
-    (version "6.1.1")
+    (version "7.0.0")
     (source (origin
               (method url-fetch)
               (uri (cran-uri "roxygen2" version))
               (sha256
                (base32
-                "0wq29ilqas8yn2z8v49fk0hbgchg29nmyyhwczgdipz0cbhbfipd"))))
+                "13sani3y9ql56cvja8pfjpwsbq8pismc52ns1cq1zgi0jycgqja5"))))
     (build-system r-build-system)
     (propagated-inputs
      `(("r-brew" ,r-brew)
@@ -2326,6 +2326,7 @@ tables, autolinks and strikethrough text.")
        ("r-purrr" ,r-purrr)
        ("r-r6" ,r-r6)
        ("r-rcpp" ,r-rcpp)
+       ("r-rlang" ,r-rlang)
        ("r-stringi" ,r-stringi)
        ("r-stringr" ,r-stringr)
        ("r-xml2" ,r-xml2)))