Fixes UNB-1938 issue in which updates wouldn't work after branch gh-pages first created

Author: whoseoyster

.github/workflows/docs.yml

@@ -36,5 +36,6 @@ jobs:
       with:
         branch: gh-pages
         directory: gh-pages
+        force: true # This push fails otherwise
         github_token: ${{ secrets.GITHUB_TOKEN }}
     # ===============================

CHANGELOG.md

@@ -10,6 +10,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 ### Added
 
 * Can specify `ModelType.keras`.
+* API documentation.
 
 ### Changed