chore(xo-lib): use Babel 7

packages/xo-lib/.babelrc.js

@@ -0,0 +1,3 @@
+module.exports = require('../../@xen-orchestra/babel-config')(
+  require('./package.json')
+)

packages/xo-lib/package.json

@@ -24,6 +24,9 @@
   "files": [
     "dist/"
   ],
+  "browserslist": [
+    "> 2%"
+  ],
   "engines": {
     "node": ">=6"
   },
@@ -33,10 +36,10 @@
     "make-error": "^1.0.4"
   },
   "devDependencies": {
-    "babel-cli": "^6.24.1",
+    "@babel/cli": "^7.0.0",
+    "@babel/core": "^7.0.0",
+    "@babel/preset-env": "^7.0.0",
     "babel-plugin-lodash": "^3.3.2",
-    "babel-preset-env": "^1.5.2",
-    "babel-preset-stage-3": "^6.24.1",
     "cross-env": "^5.1.3",
     "rimraf": "^2.6.1"
   },
@@ -46,28 +49,5 @@
     "prebuild": "rimraf dist/",
     "predev": "yarn run prebuild",
     "prepublishOnly": "yarn run build"
-  },
-  "babel": {
-    "env": {
-      "test": {
-        "ignore": null
-      }
-    },
-    "ignore": "*.spec.js",
-    "plugins": [
-      "lodash"
-    ],
-    "presets": [
-      [
-        "env",
-        {
-          "targets": {
-            "browsers": "> 2%",
-            "node": 4
-          }
-        }
-      ],
-      "stage-3"
-    ]
   }
 }