update Vanhove reference on multicollinearity (#865)

Author: bbolker

R/check_collinearity.R

@@ -123,8 +123,8 @@
 #' - McElreath, R. (2020). Statistical rethinking: A Bayesian course with
 #'   examples in R and Stan. 2nd edition. Chapman and Hall/CRC.
 #'
-#' - Vanhove, J. (2019). Collinearity isn't a disease that needs curing.
-#'   [webpage](https://janhove.github.io/posts/2019-09-11-collinearity/)
+#' - Vanhove, J. (2021) Collinearity Isn’t a Disease That Needs Curing.
+#'   Meta-Psychology, 5. \doi{10.15626/MP.2021.2548}
 #'
 #' - Zuur AF, Ieno EN, Elphick CS. A protocol for data exploration to avoid
 #'   common statistical problems: Data exploration. Methods in Ecology and