Revoke makefile change

Author: rmk135

Makefile

@@ -55,7 +55,7 @@ test-py2: build
 test: build
 	# Unit tests with coverage report
 	coverage erase
-	-coverage run --rcfile=./.coveragerc -m unittest2 discover -s tests/unit/ -p test_*py3*.py
+	coverage run --rcfile=./.coveragerc -m unittest2 discover -s tests/unit/ -p test_*py3*.py
 	coverage report --rcfile=./.coveragerc
 	coverage html --rcfile=./.coveragerc