Update testMatch to also be compatible with Jest 24 (#6313)

Author: ngbrown

packages/react-scripts/scripts/utils/createJestConfig.js

@@ -33,7 +33,7 @@ module.exports = (resolve, rootDir, isEjecting) => {
     setupFilesAfterEnv: setupTestsFile ? [setupTestsFile] : [],
     testMatch: [
       '<rootDir>/src/**/__tests__/**/*.{js,jsx,ts,tsx}',
-      '<rootDir>/src/**/?(*.)(spec|test).{js,jsx,ts,tsx}',
+      '<rootDir>/src/**/*.{spec,test}.{js,jsx,ts,tsx}',
     ],
     testEnvironment: 'jest-environment-jsdom-fourteen',
     transform: {