[Tests] move 0.6 to allowed failures, because it won‘t build on travis

Author: ljharb

.travis.yml

@@ -17,7 +17,6 @@ node_js:
   - "0.12"
   - "0.10"
   - "0.8"
-  - "0.6"
 before_install:
   - 'case "${TRAVIS_NODE_VERSION}" in 0.*) export NPM_CONFIG_STRICT_SSL=false ;; esac'
   - 'nvm install-latest-npm'