Bump roxygen2 version to 8.0.0

Change-Id: Ib5f5c66bd3db80d147370d2f16fc1c340240477c
diff --git a/man/persistAccessToken-KorAPConnection-method.Rd b/man/persistAccessToken-KorAPConnection-method.Rd
index 898fc3e..1929953 100644
--- a/man/persistAccessToken-KorAPConnection-method.Rd
+++ b/man/persistAccessToken-KorAPConnection-method.Rd
@@ -32,7 +32,7 @@
 \seealso{
 \code{\link[=clearAccessToken]{clearAccessToken()}}, \code{\link[=auth]{auth()}}
 
-Other initialization functions: 
+Other initialization functions:
 \code{\link{KorAPConnection-class}},
 \code{\link{auth,KorAPConnection-method}},
 \code{\link{clearAccessToken,KorAPConnection-method}}