feat: Add eslint-plugin-flowtype to compat plugins (#115)

Author: nzakas

packages/migrate-config/src/compat-plugins.js

@@ -7,4 +7,5 @@ export default [
 	"eslint-plugin-ava",
 	"eslint-plugin-react-hooks",
 	"eslint-plugin-import",
+	"eslint-plugin-flowtype",
 ];