fix: fix example deployment

Author: armand1m

package.json

@@ -32,7 +32,7 @@
     "lint": "prettier --check 'src/**/*.{ts,tsx}'",
     "lint:fix": "prettier --write 'src/**/*.{ts,tsx}'",
     "prepare": "npm run build",
-    "predeploy-example": "cd example && npm install && npm run build",
+    "predeploy-example": "cross-env SKIP_PREFLIGHT_CHECK=true cd example && npm install && npm run build",
     "deploy-example": "gh-pages -d example/build",
     "travis-deploy-once": "travis-deploy-once"
   },