yarn test:integration 'No tests found' on Windows
Hi BJ!

Current contents of `jest.config.js` is below.
```node
testMatch: ['<rootDir>/test/**/?(*.)+(spec|test).js?(x)']
```
run `yarn test:integration` command and 'No tests found' message appear like below.

```zsh
λ yarn test:integration
yarn run v1.13.0
$ npm test -- test/integration

> fuzzmon-backend@0.0.1 test C:\Users\XXX\Desktop\dev\fbackend
> cross-env NODE_ENV=test jest --no-watchman "test/integration"

No tests found, exiting with code 1
Run with `--passWithNoTests` to exit with code 0
```
So I changed regex like  `testMatch: ['<rootDir>/test/**/*.(spec|test).(js|jsx)']`

and works well!

```zsh
> cross-env NODE_ENV=test jest --no-watchman

 PASS  test/integration/home.test.js
  Home
    GET /
      √ <200> should always return with the API server information (34ms)
    GET /spec
      √ <200> should always return API specification in swagger format (7ms)

Test Suites: 1 passed, 1 total
Tests:       2 passed, 2 total
Snapshots:   0 total
Time:        4.515s
Ran all test suites.
```

Thanks, Bro~👍 



