fix: Remove unnecessary import/no-duplicates rule (#11)

* import/no-duplicates is already in eslint-config-airbnb
* Add yarn.lock
* Use yarn on CI

Author: thymikee

.travis.yml

@@ -1,17 +1,15 @@
 language: node_js
 cache:
+  yarn: true
   directories:
     - node_modules
 notifications:
   email: false
 node_js:
   - '8'
-  - '6'
   - '4'
-before_script:
-  - npm prune
 after_success:
-  - npm run semantic-release
+  - yarn semantic-release
 branches:
   except:
     - /^v\d+\.\d+\.\d+$/

index.js

@@ -19,7 +19,6 @@ module.exports = {
     'flowtype/require-return-type': [0, 'always', {annotateUndefined: 'never'}],
     'flowtype/require-valid-file-annotation': 2,
     'import/extensions': 0,
-    'import/no-duplicates': 2,
     'import/no-dynamic-require': 0,
     'import/no-unresolved': 2,
     'new-cap': 0,