gnu: r-rhtslib: Update to 1.20.0.

* gnu/packages/bioinformatics.scm (r-rhtslib): Update to 1.20.0.
[native-inputs]: Add r-knitr.

gnu/packages/bioinformatics.scm

@@ -8630,14 +8630,14 @@ (define-public r-r4rna
 (define-public r-rhtslib
   (package
     (name "r-rhtslib")
-    (version "1.18.1")
+    (version "1.20.0")
     (source
      (origin
        (method url-fetch)
        (uri (bioconductor-uri "Rhtslib" version))
        (sha256
         (base32
-         "0gkbrmrcg55c9s5166ifljlx0v25rv4ijdyp4wf4c292xd6chy2l"))))
+         "186r7icrkzrni1c4n33ip7dlsfgys7hnqf0simvxrpl3yhh3ygdi"))))
     (properties `((upstream-name . "Rhtslib")))
     (build-system r-build-system)
     ;; Without this a temporary directory ends up in the Rhtslib.so binary,
@@ -8649,7 +8649,8 @@ (define-public r-rhtslib
     (inputs
      `(("zlib" ,zlib)))
     (native-inputs
-     `(("pkg-config" ,pkg-config)))
+     `(("pkg-config" ,pkg-config)
+       ("r-knitr" ,r-knitr)))
     (home-page "https://github.com/nhayden/Rhtslib")
     (synopsis "High-throughput sequencing library as an R package")
     (description