Update README.md (#872)

Update agents SDK installation

Author: srilaasya

README.md

@@ -216,7 +216,7 @@ All decorators support:
 Build multi-agent systems with tools, handoffs, and guardrails. AgentOps provides first-class integration with OpenAI Agents.
 
 ```bash
-pip install agents-sdk
+pip install openai-agents
 ```
 
 - [AgentOps integration example](https://docs.agentops.ai/v1/integrations/agentssdk)