Update README.md

fix type in Configuration section

Author: L0rD59

README.md

@@ -33,7 +33,7 @@ You can change how the API key should be delivered and the name of the parameter
 ```yaml
 uecode_api_key:
     delivery: query #or header
-    parameter: some_value # defaults to `api_key`
+    parameter_name: some_value # defaults to `api_key`
 ```
 
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