Fix a missing parenthesis

common/r-packages.scm

@@ -39,7 +39,7 @@
                     (method url-fetch)
                     (uri "https://s3.amazonaws.com/h2o-release/h2o/rel-3.42.0/2/Rjar/h2o.jar")
                     (sha256
-                     (base32 "11z95h2spfwahi1pgrw5l2vgfl30dggrqdbf89l9g47allzknxxi")))
+                     (base32 "11z95h2spfwahi1pgrw5l2vgfl30dggrqdbf89l9g47allzknxxi"))))
     (propagated-inputs (list r-rcurl r-jsonlite))
     (home-page "https://github.com/h2oai/h2o-3")
     (synopsis "R Interface for the 'H2O' Scalable Machine Learning Platform")