Update README.md (intercom#379)

SDK regeneration (intercom#378)

Co-authored-by: fern-api <115122769+fern-api[bot]@users.noreply.github.com>

Make `IntercomClient::$password` explicitly nullable (intercom#373)

This prevents a deprecation warning from showing up since PHP 8.4

```
Deprecated: Intercom\IntercomClient::__construct(): Implicitly marking parameter $password as nullable is deprecated, the explicit nullable type must be used instead in /<redacted-path>/vendor/intercom/intercom-php/src/IntercomClient.php on line 148
```

Http: add support for PSR17/PSR18 and drop usage of deprecated client…

… discovery (intercom#363)

Merge pull request intercom#342 from intercom/jn/update-readme

update readme

Merge pull request intercom#342 from intercom/jn/update-readme

update readme

Fix bug where handleResponse() is called twice (intercom#318)

You'll probably want better tests here....

fixing broken Contacts update method (intercom#311)

* fixing broken update method

"update" should follow the same pattern as other methods like deleteContact and getContact that require "id" based on the API documentation.

* updates tests and README for broken Contact method

Update readme with API versions (intercom#308)

Add support for teams (intercom#305)

* Add support for teams

* Typo fix