chore: fix typo

Author: horike37

README.md

@@ -236,5 +236,4 @@ custom:
           'integration.request.querystring.MessageAttribute.1.Value.DataType': "'String'"
           'integration.request.querystring.MessageAttribute.2.Name': "'cognitoAuthenticationProvider'"
           'integration.request.querystring.MessageAttribute.2.Value.StringValue': 'context.identity.cognitoAuthenticationProvider'
-          'integration.request.querystring.Me]
 ```