Bump roxygen2 version to 8.0.0

Change-Id: Ib5f5c66bd3db80d147370d2f16fc1c340240477c
diff --git a/DESCRIPTION b/DESCRIPTION
index 669bd69..aeb56f8 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -23,7 +23,6 @@
 BugReports: https://github.com/KorAP/RKorAPClient/issues
 Encoding: UTF-8
 LazyData: false
-RoxygenNote: 7.3.3
 Imports:
     R.cache,
     broom,
@@ -78,3 +77,4 @@
     'reexports.R'
     'textMetadata.R'
 Roxygen: list(markdown = TRUE)
+Config/roxygen2/version: 8.0.0