Mirroring actual yml from metric_learning repo

Author: mvargas33

.github/workflows/main.yml

@@ -19,18 +19,41 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        python-version: ['3.6', '3.7', '3.8', '3.9', 'pypy-3.6', 'pypy-3.7']
+        python-version: ['3.6', '3.7', '3.8', '3.9']
     steps:
       - uses: actions/checkout@v2
       - name: Set up Python
         uses: actions/setup-python@v2
         with:
           python-version: ${{ matrix.python-version }}
-      - name: Display Python version
+      - name: Run Tests without skggm
         run:  |
           sudo apt-get install liblapack-dev
           pip install --upgrade pip pytest
           pip install wheel cython numpy scipy codecov pytest-cov scikit-learn
           pytest test --cov
+      - name: Run Tests with skggm
+        env:
+          SKGGM_VERSION: a0ed406586c4364ea3297a658f415e13b5cbdaf8
+        run:  |
+          sudo apt-get install liblapack-dev
+          pip install --upgrade pip pytest
+          pip install wheel cython numpy scipy codecov pytest-cov scikit-learn
+          pip install git+https://github.com/skggm/skggm.git@${SKGGM_VERSION}
+          pytest test --cov
+      - name: Run Tests with skggm + scikit-learn 0.20.3
+        env:
+          SKGGM_VERSION: a0ed406586c4364ea3297a658f415e13b5cbdaf8
+        run:  |
+          sudo apt-get install liblapack-dev
+          pip install --upgrade pip pytest
+          pip install wheel cython numpy scipy codecov pytest-cov
+          pip install scikit-learn==0.20.3
+          pip install git+https://github.com/skggm/skggm.git@${SKGGM_VERSION}
+          pytest test --cov
+      - name: Syntax checking with flake8
+        run: |
+          pip install flake8
+          flake8 --extend-ignore=E111,E114 --show-source;
       - name: Codecov
         uses: codecov/codecov-action@v2.1.0