Update README.md

[JobRamos]

In the What's next section, the --agent flag has been updated to --runtime, therefore the following command in the guide will fail:

agentcore add online-eval --name QualityMonitor --agent CustomerSupport --evaluator Builtin.GoalSuccessRate --sampling-rate 100 --enable-on-create

Only a quick update is necessary

Amazon Bedrock AgentCore Samples Pull Request

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