refactor(babel): update build steps and package entry point

BREAKING CHANGE: new package entry point

.travis.yml

@@ -5,29 +5,19 @@ node_js:
  - 6
  - 4
 
-env:
-  - BABEL_ENV=development
-
 matrix:
   fast_finish: true
 
 cache:
   directories:
     - node_modules
 
-before_script:
-  - npm prune
+after_success:
+  - npm install --only=production codeclimate-test-reporter semantic-release
 
 before_deploy:
-  - npm install semantic-release
-  - npm install codeclimate-test-reporter
-
   - npm run coverage -- --coverage-report=text-lcov | codeclimate-test-reporter
 
-  - BABEL_ENV=v4 npm run compile -- -d lib/node4
-  - BABEL_ENV=v6 npm run compile -- -d lib/node6
-  - BABEL_ENV=v7 npm run compile -- -d lib/node7
-
 deploy:
   skip_cleanup: true
   provider: script

package.json

@@ -9,7 +9,7 @@
     "url": "https://github.com/ahmadnassri/logress.git"
   },
   "license": "ISC",
-  "main": "lib/node4/index.js",
+  "main": "lib/index.js",
   "keywords": [
     "logress"
   ],