fix: Fix yarn install.

Author: treshugart

init/.travis.yml

@@ -4,15 +4,15 @@ node_js: stable
 notifications:
   email: false
 before_script:
-  - npm prune
   - export DISPLAY=:99.0
   - sh -e /etc/init.d/xvfb start
+install:
   - npm install -g yarn
   - yarn install
 script:
   - sk-bundle
   - if [ "<%= "${TRAVIS_SECURE_ENV_VARS}" %>" = "true" ]; then
-    npm test -- --testingbot;
+    npm test -- --all;
     else
     npm test -- --browsers Firefox;
     fi