Commit 8968427

@@ -8,6 +8,7 @@ rvm:
 before_script:
   - curl -sL https://deb.nodesource.com/setup_10.x | sudo -E bash -
   - wget -q -O - https://dl.yarnpkg.com/debian/pubkey.gpg | sudo apt-key add -
+  - sudo echo "deb https://dl.yarnpkg.com/debian/ stable main" > /etc/apt/sources.list.d/yarn.list
   - sudo apt-get update -qq
   - sudo apt-get install -y -qq yarn
   - psql -c 'create database proof;' -U postgres