add period at the end of the sentence

Author: mathemancer

content/blog/entries/apache-airflow-testing-with-pytest/contents.lr

@@ -196,6 +196,6 @@ earlier in the python file.
 
 We hope that these hints are helpful to the reader.  For more, and for the
 context around the snippets shown here, please take a look at
-[the repo][frozen_cccatalog]
+[the repo][frozen_cccatalog].
 
 [frozen_cccatalog]: https://github.com/creativecommons/cccatalog/tree/c4b80600eb5695cc294e1791ba90bdc3a408b7b9/src/cc_catalog_airflow