chore: fix jest-watch-select-projects (testing-library#309)

Author: nickserv

jest.config.js

@@ -2,8 +2,11 @@ const config = require('kcd-scripts/jest')
 
 module.exports = {
   ...config,
-  projects: [
+  watchPlugins: [
+    ...config.watchPlugins,
     require.resolve('jest-watch-select-projects'),
+  ],
+  projects: [
     require.resolve('./tests/jest.config.dom'),
     require.resolve('./tests/jest.config.node'),
   ],