Update from-flow.md

Author: swyxio

docs/migration/from-flow.md

@@ -4,6 +4,7 @@ title: From Flow
 ---
 
 - Try flow2ts: `npx flow2ts` - doesn't work 100% but saves some time ([see this and other tips from @braposo](https://github.com/typescript-cheatsheets/react-typescript-cheatsheet/pull/79#issuecomment-458227322) at TravelRepublic)
+- Try Airtable's codemod: https://github.com/Airtable/typescript-migration-codemod   https://medium.com/airtable-eng/the-continual-evolution-of-airtables-codebase-migrating-a-million-lines-of-code-to-typescript-612c008baf5c
 - [Incremental Migration to TypeScript on a Flowtype codebase][entria] at Entria
 - [MemSQL's Studio's migration](https://davidgom.es/porting-30k-lines-of-code-from-flow-to-typescript/) - blogpost with many useful tips
 - Retail-UI's Codemod: https://github.com/skbkontur/retail-ui/tree/master/packages/react-ui-codemodes/flow-to-ts