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It's not strictly required, but it's useful metadata, and part of the recommended license template text (see http://choosealicense.com/licenses/isc/ and https://opensource.org/licenses/isc-license)
postmanlabs/httpbin,krissman/httpbin,postmanlabs/httpbin,pestanko/httpbin,krissman/httpbin,bradparks/httpbin__http_echo_service_for_testing_http_requests,pestanko/httpbin,kennethreitz/httpbin,bradparks/httpbin__http_echo_service_for_testing_http_requests,Runscope/httpbin,Runscope/httpbin,ewdurbin/httpbin,kennethreitz/httpbin,ewdurbin/httpbin