update readme

Author: krrr

README.md

@@ -1,2 +1,6 @@
 # MCP Java SDK for Java 8
-Modified most code and downgraded dependencies from the official v0.8.1 version, to support old Java 8 and Spring 2.x
+Modified most code and downgraded dependencies from the official v0.8.1 version, to support old Java 8 and Spring Boot 2.x
+
+Only the scenario using mcp-spring-webmvc as the MCP server has been tested, and there might be errors in other cases, such as the client.
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+