feat(api): remove Stainless attribution from readme

Author: stainless-app[bot]

.stats.yml

@@ -1,4 +1,4 @@
 configured_endpoints: 42
 openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/imagekit-inc%2Fimagekit-d1a3e6dfc45ae832b6b14a0aef25878985c679fa9f48c1470df188b1578ba648.yml
 openapi_spec_hash: 1d382866fce3284f26d341f112988d9d
-config_hash: 5f7498f5ea66e8a544c6c37b10f77467
+config_hash: ff23f46fe08ef3f43c57c8cf13eff3a1

README.md

@@ -9,8 +9,6 @@
 
 The Image Kit PHP library provides convenient access to the Image Kit REST API from any PHP 8.1.0+ application.
 
-It is generated with [Stainless](https://www.stainless.com/).
-
 ## Documentation
 
 The REST API documentation can be found on [imagekit.io](https://imagekit.io/docs/api-reference).