[fix] Update Dependencies (#295)

Author: linuxwolf

.gitignore

@@ -6,4 +6,3 @@ old/
 node_modules
 yarn.lock
 npm-shrinkwrap.json
-package-lock.json

.travis.yml

@@ -1,19 +1,16 @@
 language: node_js
 script: gulp test:nodejs:single
 node_js:
-  - 6.0.0 # min
-  - lts/boron
-  - 8.0.0
-  - lts/carbon
   - lts/dubnium
+  - lts/erbium
   - stable
 jobs:
   include:
     - stage: Browser tests
       script: gulp travis:browser
-      node_js: lts/carbon
+      node_js: lts/erbium
       addons:
         sauce_connect: true
     - stage: Lint
       script: gulp test:lint
-      node_js: lts/carbon
+      node_js: lts/erbium