Drop to only testing one Python version

Author: brandon-rhodes

.github/workflows/ci.yml

@@ -12,41 +12,37 @@ on:
       - master
 
 jobs:
-  doctest-and-lint:
-    runs-on: ubuntu-latest-turned-off-right-now
-    container: ubuntu:20.04
-    steps:
-    - uses: actions/checkout@v2
-    - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v2
-      with:
-        python-version: 3.6.15
+  # doctest-and-lint:
+  #   runs-on: ubuntu-latest
+  #   container: ubuntu:20.04
+  #   steps:
+  #   - uses: actions/checkout@v2
+  #   - name: Set up Python ${{ matrix.python-version }}
+  #     uses: actions/setup-python@v2
+  #     with:
+  #       python-version: 3.6.15
 
-    - name: Install pinned dependencies
-      run: |
-        python -m pip install --upgrade pip
-        pip install astropy==3.0.1 docutils==0.17.1 matplotlib==3.3.0 numpy==1.15.4 pandas==1.0.0 pyflakes scipy==1.2.2 sphinx==1.7.2 spktype21
+  #   - name: Install pinned dependencies
+  #     run: |
+  #       python -m pip install --upgrade pip
+  #       pip install astropy==3.0.1 docutils==0.17.1 matplotlib==3.3.0 numpy==1.15.4 pandas==1.0.0 pyflakes scipy==1.2.2 sphinx==1.7.2 spktype21
 
-    - name: Install Skyfield
-      run: |
-        python setup.py sdist
-        pip install -e .
+  #   - name: Install Skyfield
+  #     run: |
+  #       python setup.py sdist
+  #       pip install -e .
 
-    - name: Doctest
-      run: |
-        ./test-docs.sh
+  #   - name: Doctest
+  #     run: |
+  #       ./test-docs.sh
 
-    - name: Lint
-      run: |
-        pyflakes $(find skyfield/ -name '*.py')
+  #   - name: Lint
+  #     run: |
+  #       pyflakes $(find skyfield/ -name '*.py')
 
   test:
     runs-on: ubuntu-latest
     container: ubuntu:20.04
-    strategy:
-      fail-fast: false
-      matrix:
-        python: [python2, python3]
 
     steps:
     - uses: actions/checkout@v2
@@ -55,7 +51,7 @@ jobs:
       run: |
         apt update
         apt install -y -y -q -q python3-virtualenv virtualenv
-        virtualenv -p ${{matrix.python}} V
+        virtualenv V
 
     - name: Build scripts
       run: |