update travis

Author: 浩知

.travis.yml

@@ -1,9 +1,9 @@
 language: node_js
 node_js:
-  - '4'
-  - '5'
-  - '6'
-  - '7'
+  - '8'
+  # - '9'
+  - '10'
+  - '11'
 sudo: false
 script:
   - "npm run test"

README.md

@@ -1,7 +1,7 @@
 # safe-trim
 ---
 
-[![Build Status](https://travis-ci.org/aligay/safe-trim.svg?branch=1.0.15)](https://travis-ci.org/aligay/safe-trim/branches)
+[![Build Status](https://travis-ci.org/aligay/safe-trim.svg?branch=master)](https://travis-ci.org/aligay/safe-trim/branches)
 [![codecov](https://codecov.io/gh/aligay/safe-trim/branch/master/graph/badge.svg)](https://codecov.io/gh/aligay/safe-trim)
 [![dependencies Status](https://david-dm.org/aligay/safe-trim/status.svg)](https://david-dm.org/aligay/safe-trim)
 [![devDependencies Status](https://david-dm.org/aligay/safe-trim/dev-status.svg)](https://david-dm.org/aligay/safe-trim?type=dev)