chore: drop support node-v0

see: https://github.com/nodejs/LTS#lts_schedule

Author: 59naga

.travis.yml

@@ -11,7 +11,6 @@ language: node_js
 before_install:
   - if [[ `npm -v` != 3* ]]; then npm i -g npm@3; fi
 node_js:
-  - '0'
   - 4
   - 5
   - 6

test/index.js

@@ -54,10 +54,6 @@ describe('babel-plugin-add-module-exports', () => {
         // assert module root (module.exports) object
         equal(module, testCase.expected.module)
 
-        if (typeof testCase.expected.exports !== 'object') {
-          return // avoid "Object.keys called on non-object" in node-v0
-        }
-
         // assert each common entry is exported without error
         Object.keys(testCase.expected.exports).forEach((key) =>
           equal(module[key], testCase.expected.exports[key]))