Try to fix GitHub actions workflow

Author: adamtheturtle

.github/workflows/ci.yml

@@ -15,10 +15,10 @@ jobs:
 
     strategy:
       matrix:
-        python-version: [3.6, 3.7, 3.8]
         # These versions match the minimum and maximum versions of pip in
         # requirements.txt
         extra-pip-version-to-install: ['==10.0.1', '<= 19']
+        python-version: [3.6, 3.7, 3.8]
 
     steps:
       - uses: actions/checkout@v2
@@ -30,7 +30,7 @@ jobs:
       - name: "Install dependencies"
         run: |
           pip install --upgrade --editable .[dev]
-          pip install --upgrade pip ${{extra-pip-version-to-install}}
+          pip install --upgrade 'pip ${{ extra-pip-version-to-install }}'
           pip install flake8
 
       - name: "Lint"