Update eslint-config-airbnb-base to version 7.0.0 🚀 (#109)

* chore(package): update eslint-config-airbnb-base to version 7.0.0

https://greenkeeper.io/

* Update minimum versions

Update the minimum versions of eslint and eslint-plugin-import to match the peerDependency of eslint-config-airbnb-base.

Author: greenkeeperio-bot

package.json

@@ -27,9 +27,9 @@
     "unified-engine-atom": "^2.0.0"
   },
   "devDependencies": {
-    "eslint": "^3.1.1",
-    "eslint-config-airbnb-base": "^5.0.0",
-    "eslint-plugin-import": "^1.10.2",
+    "eslint": "^3.4.0",
+    "eslint-config-airbnb-base": "^7.0.0",
+    "eslint-plugin-import": "^1.14.0",
     "remark-cli": "^2.0.0"
   },
   "eslintConfig": {