Change to use pip install --editable rather than python setup.py develop

.github/workflows/build.yml

@@ -37,7 +37,7 @@ jobs:
       - name: Install js dependencies
         run: npm install jasmine-core@2.3.4 karma@1.5 karma-coverage@1.1.1 karma-jasmine@0.3.8 karma-firefox-launcher@2.1.0 karma-coveralls@1.1.2
       - name: Install opal
-        run: python setup.py develop
+        run: pip install -e .
         env:
           OPAL_TEST_USE_POSTGRES: 1
       - name: Install dependencies
@@ -76,13 +76,8 @@ jobs:
         with:
           python-version: ${{ matrix.python-version }}
       - name: Install opal
-        run: python setup.py develop
+        run: pip install -e .
       - name: Install dependencies
         run: pip install -r test-requirements.txt
       - name: run tests
         run: opal test py
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