Deprecated dependencies (guzzlehttp/ringphp and guzzlehttp/stream)

I just installed this package after getting a message telling me the swiftype library has been abandonded:

```
Package swiftype/swiftype-common-php is abandoned, you should avoid using it. Use elastic/openapi-codegen instead.
Package swiftype/swiftype-site-search-php is abandoned, you should avoid using it. Use elastic/site-search instead
```
Now with this elastic/site-search-php package installed, I see that it uses guzzlehttp packages and those packages are giving me warnings about those packages having been abandoned.

```
Package guzzlehttp/ringphp is abandoned, you should avoid using it. No replacement was suggested.
Package guzzlehttp/streams is abandoned, you should avoid using it. No replacement was suggested.
```

It looks like I traded my swiftype package warnings of abandonment for guzzlehttp abandonment warnings now that ringphp and streams aren't a part of the new Guzzle 6... Anyway, I just thought I should bring this to your attention so that you are aware and can update this package accordingly. 😊