Merge pull request #553 from berggren/patch-1

Add source distribution for PyPi when building

Author: thomaspatzke

Makefile

@@ -92,7 +92,7 @@ test-backend-es-qs:
 	tests/test-backend-es-qs.py
 
 build: tools/sigmac tools/merge_sigma tools/sigma/*.py tools/setup.py tools/setup.cfg
-	cd tools && python3 setup.py bdist_wheel
+	cd tools && python3 setup.py bdist_wheel sdist
 
 upload-test: build
 	twine upload --repository-url https://test.pypi.org/legacy/ tools/dist/*