Update config.yml

Author: cclauss

.circleci/config.yml

@@ -2,11 +2,14 @@ version: 2.0
 
 build_and_test: &build_and_test_steps
   - checkout
+  - run: pip install pipx || true
+  - run: pip install --user pipx || true
+  - run: sudo pip install pipx || true
   - run: pip --version || true
   - run: pip3 --version || true
   - run: python --version || true
   - run: python3 --version || true
-  - run: sudo python -m pip install --upgrade pip
+  - run: sudo pip install --upgrade pip || true
   - run: sudo pip install pytest -r requirements.txt
   - run: pip install --user .
   - run: python --version ; pip --version ; pwd ; ls -l