Updated travis config

.travis.yml

@@ -4,13 +4,11 @@ node_js:
 - '4'
 - '6'
 - '8'
-before_install:
-- npm install -g npm@'>=2.9.1'
 before_script:
 - npm install -g coveralls@2.10.0
 script: 
 - npm run -s travis-test
-- '[ "${TRAVIS_NODE_VERSION}" = "0.12" ] && travis_retry travis_wait npm run -s travis-browser-test || true'
+- '[ "${TRAVIS_NODE_VERSION}" = "8" ] && travis_retry travis_wait npm run -s travis-browser-test || true'
 env:
   global:
   - secure: VUVKZgxROvo9InyJxKZ5GYbVVNXe1nq+c3nSwQkQLiXR6zW8bcXlmVxI31vWfvr06YyD7bhVnVB4u/dLFImWGUQ4JZWVCRd+Tmi3QhsD+e0Lj6UVeW3vPVofC+mRBeXQxTuR80WmyPgXPKqFFrObh8evUw217CvP4ICwCXfuTas=