Update Travis to Node 8

.gitattributes

@@ -0,0 +1,3 @@
+# Auto detect text files and perform LF normalization
+* text=auto
+package.json text eol=lf 

.gitignore

@@ -1,6 +1,7 @@
 # NPM
 node_modules
 npm-debug.log
+package-lock.json
 
 # WebStorm user-specific
 .idea/workspace.xml

.npmignore

@@ -7,6 +7,7 @@
 .eslintcache
 .eslintignore
 .eslintrc.json
+.gitattributes
 .nyc_output
 .npmignore
 .travis.yml

.travis.yml

@@ -1,7 +1,6 @@
 language: node_js
 node_js:
-  - "4"
-  - "6"
+  - "8"
 script:
   - npm run eslint
   - npm run test -- --failTaskOnError --suppressPassed
@@ -9,4 +8,4 @@ script:
 after_success:
 ## We only need to run coveralls for one node version (doesn't matter which one).
 ## We also ignore publishing failures, since restarting an existing travis build would otherwise break.
-  - if node --version | grep -q ^v6 ; npm run coverage && npm run coveralls; fi
+  - if node --version | grep -q ^v8 ; npm run coverage && npm run coveralls; fi