🗂️ update env exampe

Author: shroominic

.env.example

@@ -1,18 +1,20 @@
+# (set True to enable logging)
+VERBOSE=False
+
 # (required)
 OPENAI_API_KEY=
+# ANTHROPIC_API_KEY=
+
 # (optional, required for production)
 # CODEBOX_API_KEY=
-# (set True to enable logging)
-VERBOSE=False
+
 # (optional, required for Azure OpenAI)
 # OPENAI_API_TYPE=azure
 # OPENAI_API_VERSION=2023-07-01-preview
 # OPENAI_API_BASE=
 # DEPLOYMENT_NAME=
 
-STORAGE_TYPE="file" # "file" or "redis"
-
-RD_HOST=
-RD_PORT=
-
-SESSION_STORAGE_FOLDER="session_storage"
+# (optional, [codebox, postgres or redis])
+# HISTORY_BACKEND=postgres
+# REDIS_URL=
+# POSTGRES_URL=