Add svg rendering for error example (facebook#3825)

* Add svg rendering for error example

* Use static svg error example

Author: marionebl

README.md

@@ -84,7 +84,9 @@ Open [http://localhost:3000](http://localhost:3000) to view it in the browser.
 The page will automatically reload if you make changes to the code.<br>
 You will see the build errors and lint warnings in the console.
 
-<img src='https://camo.githubusercontent.com/41678b3254cf583d3186c365528553c7ada53c6e/687474703a2f2f692e696d6775722e636f6d2f466e4c566677362e706e67' width='600' alt='Build errors'>
+<p align='center'>
+<img src='https://cdn.rawgit.com/marionebl/create-react-app/9f62826/screencast-error.svg' width='600' alt='Build errors'>
+</p>
 
 ### `npm test` or `yarn test`
 

package.json

@@ -13,6 +13,7 @@
     "publish": "tasks/publish.sh",
     "start": "cd packages/react-scripts && node bin/react-scripts.js start",
     "screencast": "node ./tasks/screencast.js",
+    "screencast:error": "svg-term --cast jyu19xGl88FQ3poMY8Hbmfw8y --out screencast-error.svg --window --at 12000 --no-cursor",
     "test": "cd packages/react-scripts && node bin/react-scripts.js test --env=jsdom",
     "format": "prettier --trailing-comma es5 --single-quote --write 'packages/*/*.js' 'packages/*/!(node_modules)/**/*.js'",
     "precommit": "lint-staged"