Update main branch README for PaLM API decommissioning

Author: andrewheard

README.md

@@ -98,31 +98,7 @@ See
 [Contributing](https://github.com/google/generative-ai-swift/blob/main/docs/CONTRIBUTING.md)
 for more information on contributing to the Google AI SDK for Swift.
 
-## Developers who use the PaLM SDK for Swift (Deprecated)
-
-> [!IMPORTANT] The PaLM API is deprecated for use with Google AI services and
-> tools (but *not* for Vertex AI). Learn more about this deprecation, its
-> timeline, and how to migrate to use Gemini in the
-> [PaLM API deprecation guide](http://ai.google.dev/palm_docs/deprecation).
-
-​​If you're using the PaLM SDK for Swift, review the information below to
-continue using the **deprecated** PaLM SDK until you've migrated to the new
-version that allows you to use Gemini.
-
--   To continue using PaLM models, make sure your app depends on version
-    [`0.3.0`](https://github.com/google/generative-ai-swift/releases/tag/0.3.0)
-    *up to* the next minor version
-    ([`0.4.0`](https://github.com/google/generative-ai-swift/releases/tag/0.4.0))
-    of `generative-ai-swift`.
-
--   When you're ready to use Gemini models, migrate your code to the Gemini API
-    and update your app's `generative-ai-swift` dependency to version `0.4.0` or
-    higher.
-
-To see the PaLM documentation and code, go to the
-[`palm` branch](https://github.com/google/generative-ai-swift/tree/palm).
-
 ## License
 
 The contents of this repository are licensed under the
-[Apache License, version 2.0](http://www.apache.org/licenses/LICENSE-2.0).
+[Apache License, version 2.0](http://www.apache.org/licenses/LICENSE-2.0).