ci: drop node 0.6 which is broken on travis anyway

Author: goto-bus-stop

.travis.yml

@@ -15,13 +15,12 @@ node_js:
   - "0.12"
   - "0.10"
   - "0.8"
-  - "0.6"
 before_install:
   # Old npm certs are untrusted https://github.com/npm/npm/issues/20191
-  - 'if [ "${TRAVIS_NODE_VERSION}" = "0.6" ] || [ "${TRAVIS_NODE_VERSION}" = "0.8" ]; then export NPM_CONFIG_STRICT_SSL=false; fi'
+  - 'if [ "${TRAVIS_NODE_VERSION}" = "0.8" ]; then export NPM_CONFIG_STRICT_SSL=false; fi'
   - 'nvm install-latest-npm'
 install:
-  - 'if [ "${TRAVIS_NODE_VERSION}" = "0.6" ] || [ "${TRAVIS_NODE_VERSION}" = "0.9" ]; then nvm install --latest-npm 0.8 && npm install && nvm use "${TRAVIS_NODE_VERSION}"; else npm install; fi;'
+  - 'if [ "${TRAVIS_NODE_VERSION}" = "0.9" ]; then nvm install --latest-npm 0.8 && npm install && nvm use "${TRAVIS_NODE_VERSION}"; else npm install; fi;'
 matrix:
   fast_finish: true
   allow_failures: