docs: move up requirements section (#154)

Author: stainless-app[bot]

README.md

@@ -40,6 +40,10 @@ implementation("com.openai:openai-java:0.13.0")
 
 <!-- x-release-please-end -->
 
+## Requirements
+
+This library requires Java 8 or later.
+
 ## Usage
 
 ### Configure the client
@@ -414,7 +418,3 @@ This package generally follows [SemVer](https://semver.org/spec/v2.0.0.html) con
 We take backwards-compatibility seriously and work hard to ensure you can rely on a smooth upgrade experience.
 
 We are keen for your feedback; please open an [issue](https://www.github.com/openai/openai-java/issues) with questions, bugs, or suggestions.
-
-## Requirements
-
-This library requires Java 8 or later.