chore: updating travis config

Author: jarrodek

.travis.yml

@@ -10,9 +10,7 @@ addons:
 script:
 - npm test
 - if [ "${TRAVIS_PULL_REQUEST}" = "false" ]; then npm run test:sl; fi
-cache:
-  directories:
-    - node_modules
+cache: npm
 env:
   global:
     - secure: JMRvm+Pj3mTEcrhFNZTnKShuHISqGX+mR4ICFwWT8zEKF/mMosRQsVBf7xVc5DXB0x3CxjP/CauVG98/0AktVwmP1sEp0g+FFePFzux+VzvDbmynX3kkpgS82Sq11Rp6YnYb85pLjCMUG6pKCNkp8XMkcW7IX9c9AYrRgsXmQEY=