[OpenCage] Update CHANGELOG.md

[jbelien]

@Nyholm I would like to release version 4.2 of OpenCage provider but I have the following errors.

• OpenCage (see Travis) :

  call_user_func() expects parameter 1 to be a valid callback, class '\Nyholm\Psr7\Httplug\DiscoveryStrategy' not found

• MaxMindBinary (see Travis)

  Declaration of Http\Client\Curl\Client::sendRequest(Psr\Http\Message\RequestInterface $request) must be compatible with Http\Client\HttpClient::sendRequest(Psr\Http\Message\RequestInterface $request): Psr\Http\Message\ResponseInterface in /home/travis/build/geocoder-php/Geocoder/vendor/php-http/curl-client/src/Client.php on line 27

Any idea how to fix both of those issues ?

[Nyholm]

I will merge because failure are unrelated.

They are fixed in #934

[Nyholm]

Thank you

[jbelien]

Thanks a lot 👍