Merge pull request #3894 from plotly/failing-tests

Update config.yml

Author: LiamConnors

.circleci/config.yml

@@ -190,6 +190,7 @@ jobs:
       - run:
           name: Run percy snapshots
           command: |
+            npm i @percy/cli
             npx percy snapshot test/percy/
             rm test/percy/*.html