Remove cache

Author: QingWei-Li

.travis.yml

@@ -1,9 +1,6 @@
 sudo: false
 language: node_js
 node_js: stable
-cache:
-  directories:
-  - node_modules
 before_install:
 - export TRAVIS_COMMIT_MSG="[deploy] $(git log --format='%h - %B' --no-merges -n 1)"
 - export TRAVIS_COMMIT_USER="$(git log --no-merges -n 1 --format=%an)"