update docker

Author: blva

README.md

@@ -135,15 +135,16 @@ You may provide either a MongoDB connection string OR Atlas API credentials:
 
 ```shell
 docker run --rm -i \
-  mongodb/mongodb-mcp-server:latest --readOnly
+  mongodb/mongodb-mcp-server:latest
 ```
 
 ##### Option B: With MongoDB connection string
 
 ```shell
 docker run --rm -i \
   -e MDB_MCP_CONNECTION_STRING="mongodb+srv://username:password@cluster.mongodb.net/myDatabase" \
-  mongodb/mongodb-mcp-server:latest --readOnly
+  -e MDB_MCP_READ_ONLY="true" \ 
+  mongodb/mongodb-mcp-server:latest 
 ```
 
 ##### Option C: With Atlas API credentials
@@ -189,8 +190,9 @@ With connection string:
         "-i",
         "-e",
         "MDB_MCP_CONNECTION_STRING=mongodb+srv://username:password@cluster.mongodb.net/myDatabase",
+        "-e",
+        "MDB_MCP_READ_ONLY=true",
         "mongodb/mongodb-mcp-server:latest",
-        "--readOnly"
       ]
     }
   }