Install pyyaml

Author: Kevin Paul

.github/workflows/release.yml

@@ -16,7 +16,7 @@ jobs:
           python-version: 3.8
 
       - name: Install pypa/build
-        run: python -m pip install build wheel
+        run: python -m pip install build wheel pyyaml
 
       - name: Build distributions
         shell: bash -l {0}