Install @wagtail/stylelint-config-wagtail & upgrade stylelint packages

package.json

@@ -51,6 +51,7 @@
     ]
   },
   "devDependencies": {
+    "@wagtail/stylelint-config-wagtail": "0.0.4",
     "babel-core": "^6.26.3",
     "babel-jest": "^22.0.3",
     "babel-loader": "^7.1.2",
@@ -80,8 +81,8 @@
     "react-axe": "^3.1.0",
     "react-test-renderer": "^16.2.0",
     "redux-mock-store": "^1.3.0",
-    "stylelint": "^8.4.0",
-    "stylelint-scss": "^2.2.0",
+    "stylelint": "^10.0.1",
+    "stylelint-scss": "^3.6.1",
     "webpack": "^3.10.0"
   },
   "dependencies": {