Update index.rst (#184)

Author: Roller Angel

docs/index.rst

@@ -40,7 +40,7 @@ For SparkPost EU and Enterprise accounts, pass in a second parameter to set the
     from sparkpost import SparkPost
     sp = SparkPost('YOUR API KEY', 'https://api.eu.sparkpost.com/api')
 
-.. _API & SMTP: https://app.sparkpost.com/configuration/credentials
+.. _API & SMTP: https://app.sparkpost.com/account/api-keys
 
 
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