Fix vulnerabilities (#899)

* Fix eslint's vulnerabilities
* Fix mocha's vulnerabilities

package.json

@@ -55,7 +55,7 @@
     "autoprefixer": "^6.3.6",
     "babel-cli": "^6.14.0",
     "babel-core": "^6.14.0",
-    "babel-eslint": "^6.0.4",
+    "babel-eslint": "^7.2.2",
     "babel-loader": "^6.2.5",
     "babel-plugin-webpack-loaders": "^0.5.0",
     "babel-polyfill": "^6.13.0",
@@ -65,7 +65,7 @@
     "babel-preset-stage-0": "^6.5.0",
     "babel-register": "^6.14.0",
     "css-loader": "^0.23.1",
-    "eslint": "^3.17.1",
+    "eslint": "^4.18.2",
     "eslint-config-airbnb": "^14.0.0",
     "eslint-config-prettier": "^1.5.0",
     "eslint-plugin-babel": "^4.1.1",
@@ -79,7 +79,7 @@
     "jsdom": "^6.5.1",
     "kotatsu": "^0.14.0",
     "lint-staged": "^3.4.0",
-    "mocha": "^2.3.3",
+    "mocha": "^5.2.0",
     "node-sass": "^4.14.1",
     "normalize.css": "^4.1.1",
     "postcss-loader": "^0.9.1",