chore: Update travis check node 12 LTS (iamkun#847)

Author: sinh117801

.eslintrc.json

@@ -38,7 +38,7 @@
     ],
     "import/extensions": [
       2,
-      "ignorePackages"
+      "never"
     ]
   }
-}
+}

.travis.yml

@@ -4,6 +4,7 @@ cache:
     - ~/.npm
     - node_modules
 node_js:
+  - '12'
   - '10'
   - '8'
   - '6'

test/locale/zh.test.js

@@ -1,8 +1,8 @@
 import dayjs from '../../src'
 import advancedFormat from '../../src/plugin/advancedFormat'
 import weekOfYear from '../../src/plugin/weekOfYear'
-import '../../src/locale/zh.js'
-import '../../src/locale/zh-cn.js'
+import '../../src/locale/zh'
+import '../../src/locale/zh-cn'
 
 dayjs.extend(advancedFormat).extend(weekOfYear)