Update stylelint to version 13.0.0 (#5886)

package.json

@@ -111,7 +111,7 @@
     "prettier": "^1.19.1",
     "pro-download": "1.0.1",
     "serverless-http": "^2.0.2",
-    "stylelint": "^12.0.0",
+    "stylelint": "^13.0.0",
     "umi-plugin-ga": "^1.1.3",
     "umi-plugin-pro": "^1.0.2",
     "umi-types": "^0.5.0"