Update development dependency packages

package.json

@@ -28,7 +28,7 @@
     "babel-preset-react": "6.24.1",
     "copy-webpack-plugin": "4.5.2",
     "css-loader": "1.0.0",
-    "enzyme": "3.3.0",
+    "enzyme": "3.9.0",
     "enzyme-adapter-react-16": "1.1.1",
     "eslint": "4.19.1",
     "eslint-config-airbnb": "17.0.0",
@@ -39,11 +39,11 @@
     "generate-json-webpack-plugin": "0.3.1",
     "null-loader": "0.1.1",
     "style-loader": "0.21.0",
-    "stylelint": "9.3.0",
+    "stylelint": "9.10.1",
     "stylelint-config-standard": "18.2.0",
     "tap-mocha-reporter": "3.0.7",
     "tape": "4.9.1",
-    "web-ext": "2.9.2",
+    "web-ext": "3.0.0",
     "webpack": "4.15.1",
     "webpack-command": "0.3.1",
     "webpack-merge": "4.1.4"