Refactor install command

Author: ocelotl

.github/workflows/test.yml

@@ -46,8 +46,7 @@ jobs:
           python-version: ${{ env[matrix.python-version] }}
           architecture: 'x64'
       - name: Install tox
-        run: pip install tox==3.27.1
-        run: pip install -U tox-factor
+        run: pip install tox==3.27.1 -U tox-factor
       - name: Cache tox environment
         # Preserves .tox directory between runs for faster installs
         uses: actions/cache@v2