Update README.md

Names with counts of fewer than 5 names for a given year were suppressed for privacy.
Deduplicated after aggregating over all years, count dropped.

Obtained under Open Government Licence – Ontario 1.0.

README.md

@@ -1,5 +1,8 @@
----
-license: other
-license_name: open-government-licence-ontario-1.0
-license_link: https://www.ontario.ca/page/open-government-licence-ontario
----
+---
+license: other
+license_name: open-government-licence-ontario-1.0
+license_link: https://www.ontario.ca/page/open-government-licence-ontario
+pretty_name: Ontario Baby Names, 1917-2022
+size_categories:
+- 1K<n<10K
+---