README.md in ezid-client-1.7.1 vs README.md in ezid-client-1.8.0

@@ -294,15 +294,14 @@
 require "ezid/test_helper"
 ```
 
 The module provides constants:
 
-- `TEST_ARK_SHOULDER` => "ark:/99999/fk4"
-- `TEST_DOI_SHOULDER` => "doi:10.5072/FK2"
-- `TEST_USER` => "apitest"
-- `TEST_HOST` => "ezid.cdlib.org"
-- `TEST_PORT` => 443
+- `EZID_TEST_SHOULDER` => "doi:10.5072/FK2"
+- `EZID_TEST_USER` => "apitest"
+- `EZID_TEST_HOST` => "ezid.cdlib.org"
+- `EZID_TEST_PORT` => 443
 
 The test user password is not provided - contact EZID and configure as above - or use your own EZID credentials, since all accounts can mint/create on the test shoulders.
 
 A convenience method `ezid_test_mode!` is provided to configure the client to:
 
@@ -324,5 +323,9 @@
 1. Fork it ( https://github.com/[my-github-username]/ezid-client/fork )
 2. Create your feature branch (`git checkout -b my-new-feature`)
 3. Commit your changes (`git commit -am 'Add some feature'`)
 4. Push to the branch (`git push origin my-new-feature`)
 5. Create a new Pull Request
+
+## Acknowledgments
+
+- Justin Gondron (jgondron) contributed Datacite compatibility code (added in v1.8.0).