Migrate-v7-to-v8.md

1) Uninstall brace and install ace-builds

npm uninstall brace
npm install react-ace@8.0.0 ace-builds

2) migrate modes and themes

For example replace

import 'brace/mode/html'
import 'brace/theme/monokai'
import 'brace/snippets/html'

with

import 'ace-builds/src-noconflict/mode-html'
import 'ace-builds/src-noconflict/theme-monokai'
import 'ace-builds/src-noconflict/snippets/html'

3) You may need to configure the ace-build workers

See the discussion here: #725

If autocomplete or validation features are not working or you see an error message in the console regarding the ace-build worker, you may need to configure it to load properly using webpack or point to a CDN copy of the worker.