transloadit: Update API key URL.

packages/@uppy/transloadit/src/AssemblyOptions.js

@@ -19,7 +19,7 @@ function validateParams (params) {
 
   if (!params.auth || !params.auth.key) {
     throw new Error('Transloadit: The `params.auth.key` option is required. ' +
-      'You can find your Transloadit API key at https://transloadit.com/accounts/credentials.')
+      'You can find your Transloadit API key at https://transloadit.com/account/api-settings.')
   }
 }