change valign's default to middle in collapse_rows. update vignette as requested by CRAN
diff --git a/vignettes/awesome_table_in_html.Rmd b/vignettes/awesome_table_in_html.Rmd
index 473ecf0..3af994c 100644
--- a/vignettes/awesome_table_in_html.Rmd
+++ b/vignettes/awesome_table_in_html.Rmd
@@ -452,4 +452,4 @@
Since the structure of `kable` is relatively simple, it shouldn't be too difficult to convert HTML or LaTeX tables generated by other packages to a `kable` object and then use `kableExtra` to modify the outputs. If you are a package author, feel free to reach out to me and we can collaborate.
## `tables`
-The latest version of [`tables`](https://cran.r-project.org/web/packages/tables/index.html) comes with a `toKable()` function, which is compatiable with functions in `kableExtra` (>=0.9.0).
+The latest version of [`tables`](https://CRAN.R-project.org/package=tables) comes with a `toKable()` function, which is compatiable with functions in `kableExtra` (>=0.9.0).