diff --git a/lib/github-helpers.js b/lib/github-helpers.js
index e1754e7..c3af7ff 100644
--- a/lib/github-helpers.js
+++ b/lib/github-helpers.js
@@ -21,7 +21,7 @@ async function _getPullRequestReviewStates (github, prInfo) {
   const ghreviews = await github.paginate(
     github.pullRequests.getReviews({ ...prInfo, per_page: 100 }),
     res => res.data)
-  for (var review of ghreviews) {
+  for (const review of ghreviews) {
     switch (review.state) {
       case 'APPROVED':
       case 'CHANGES_REQUESTED':
diff --git a/lib/slack-github-id-map.js b/lib/slack-github-id-map.js
deleted file mode 100644
index e69de29..0000000