Bump babel, configure to target Node > 6 and remove babel-polyfill

.babelrc

@@ -1,7 +1,6 @@
 {
   "presets": [
-    ["@babel/preset-env", { "targets": { "node": "current" } }],
-    "@babel/preset-flow",
-    "@babel/preset-react"
-  ],
+    ["@babel/preset-env", { "targets": { "node": "6" } }],
+    "@babel/preset-flow"
+  ]
 }

.travis.yml

@@ -1,8 +1,8 @@
 language: node_js
 node_js:
-  - "stable"
-  - "8"
-  - "6"
+  - 'stable'
+  - '8'
+  - '6'
 before_script:
   - export TZ=Europe/Madrid
 script: npm run travis

package.json

@@ -41,7 +41,6 @@
   },
   "homepage": "https://github.com/guigrpa/oao#readme",
   "dependencies": {
-    "@babel/polyfill": "7.2.5",
     "commander": "2.19.0",
     "execa": "0.6.3",
     "globby": "6.1.0",
@@ -58,11 +57,10 @@
     "timm": "^1.6.2"
   },
   "devDependencies": {
-    "@babel/cli": "7.2.3",
-    "@babel/core": "7.3.3",
-    "@babel/preset-env": "7.3.1",
+    "@babel/cli": "^7.5.5",
+    "@babel/core": "^7.5.5",
+    "@babel/preset-env": "^7.5.5",
     "@babel/preset-flow": "7.0.0",
-    "@babel/preset-react": "7.0.0",
     "babel-core": "7.0.0-bridge.0",
     "babel-eslint": "10.0.1",
     "babel-jest": "^24.1.0",

src/index.js

@@ -2,7 +2,6 @@
 
 /* eslint-disable max-len, global-require, import/no-dynamic-require, no-console */
 
-import '@babel/polyfill';
 import path from 'path';
 import { addDefaults, merge } from 'timm';
 import program from 'commander';