Read frames in parallel using multiple threads (#65)

Author: hackermd

.github/workflows/run_unit_tests.yml

@@ -33,7 +33,7 @@ jobs:
         flake8 --exclude='bin,build,.eggs'
     - name: Check type hints with mypy
       run: |
-        mypy src
+        mypy src tests
     - name: Test with pytest
       run: |
         pytest --cov=dicomweb_client --cov-fail-under=65 tests