Update README.md

Fix the build status badge

Author: tzolov

README.md

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 # MCP Java SDK
-[![Build Status](https://github.com/modelcontextprotocol/java-sdk/actions/workflows/continuous-integration.yml/badge.svg)](https://github.com/modelcontextprotocol/java-sdk/actions/workflows/continuous-integration.yml)
+[![Build Status](https://github.com/modelcontextprotocol/java-sdk/actions/workflows/publish-snapshot.yml/badge.svg)](https://github.com/modelcontextprotocol/java-sdk/actions/workflows/publish-snapshot.yml)
 
 A set of projects that provide Java SDK integration for the [Model Context Protocol](https://modelcontextprotocol.org/docs/concepts/architecture). 
 This SDK enables Java applications to interact with AI models and tools through a standardized interface, supporting both synchronous and asynchronous communication patterns.