Correct issue with GoogleProvider getUserByToken() method

[alibori]

Calling getUserByToken from GoogleProvider crashes with:

TypeError error json_decode(): Argument #1 ($json) must be of type string, GuzzleHttp\Psr7\Stream given.

To handle this situation, added this code in getUserByToken method:

  if ($response->getBody() instanceof Stream) {
      return json_decode($response->getBody()->getContents(), true);
  }

Finally, test added to check method works as expected.

[iBotPeaches]

I don't understand how this is happening - wouldn't this affect all providers? What makes the Google one special?

Just saying this as I just pulled dev-master to get the last merged PR to test my fixes and I've never once replicated this error. Can't figure out what I'm missing.

[taylorotwell]

Needs reproduction example.

[alibori]

Hi!

Which is the best way to share a reproduction example? Sharing the composer.json file with fixed versions?

Thanks!

[driesvints]

@alibori no worries we merged this one 👍