Update .env copy.example

修复 bug

Author: Mrguanglei

.env copy.example

@@ -9,7 +9,7 @@ AGENT_RECURSION_LIMIT=30
 
 # Search Engine, Supported values: tavily (recommended), duckduckgo, brave_search, arxiv
 SEARCH_API=tavily
-TAVILY_API_KEY=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
+TAVILY_API_KEY=tvly-dev-******************
 # BRAVE_SEARCH_API_KEY=xxx # Required only if SEARCH_API is brave_search
 # JINA_API_KEY=jina_xxx # Optional, default is None