Fixed syntax error

.github/workflows/python-package.yml

@@ -29,7 +29,7 @@ jobs:
         pip install -U --only-binary=numpy --only-binary=scipy numpy scipy
         python setup.py install 
         # Testing depencies
-		pip install pytest pytest-cov coveralls
+        pip install pytest pytest-cov coveralls
 #    - name: Lint with flake8
 #     run: |
 #        # stop the build if there are Python syntax errors or undefined names