Avoid tidyselect import in ci

Change-Id: I62c39fa82cdcc6ffc8dcbe46e9067bd6ab3cb2a5
diff --git a/R/ci.R b/R/ci.R
index fff68f0..b5d06dc 100644
--- a/R/ci.R
+++ b/R/ci.R
@@ -35,7 +35,7 @@
   df %>%
     rowwise %>%
     mutate(tst = list(broom::tidy(prop.test(!!x, !!N, conf.level = conf.level)) %>%
-                        select("estimate", starts_with("conf.")) %>%
+                        select("estimate", "conf.low", "conf.high") %>%
                         rename(f = estimate)
     )) %>%
     tidyr::unnest(tst)