fix version

Author: liustve

instrumentation-genai/README.md

@@ -6,4 +6,4 @@
 | [opentelemetry-instrumentation-openai-v2](./opentelemetry-instrumentation-openai-v2) | openai >= 1.26.0 | Yes | development
 | [opentelemetry-instrumentation-vertexai](./opentelemetry-instrumentation-vertexai) | google-cloud-aiplatform >= 1.64 | No | development
 | [opentelemetry-instrumentation-weaviate](./opentelemetry-instrumentation-weaviate) | weaviate-client >= 3.0.0,<5.0.0 | No | development
-| [opentelemetry-instrumentation-mcp](./opentelemetry-instrumentation-mcp) | mcp >= 1.6.0 | No | development
+| [opentelemetry-instrumentation-mcp](./opentelemetry-instrumentation-mcp) | mcp >= 1.8.1 | No | development