Bump roxygen2 version to 8.0.0

Change-Id: Ib5f5c66bd3db80d147370d2f16fc1c340240477c
diff --git a/man/fetchNext-KorAPQuery-method.Rd b/man/fetchNext-KorAPQuery-method.Rd
index 2b1f309..99bfee6 100644
--- a/man/fetchNext-KorAPQuery-method.Rd
+++ b/man/fetchNext-KorAPQuery-method.Rd
@@ -44,7 +44,7 @@
 \url{https://ids-pub.bsz-bw.de/frontdoor/index/index/docId/9026}
 }
 \seealso{
-Other corpus search functions: 
+Other corpus search functions:
 \code{\link{corpusQuery,KorAPConnection-method}},
 \code{\link{fetchAll,KorAPQuery-method}},
 \code{\link{fetchAnnotations,KorAPQuery-method}}