Update build.yml

update codecov actions version, and docs install command

.github/workflows/build.yml

@@ -32,14 +32,11 @@ jobs:
         python -m pip install --upgrade pip setuptools wheel
         pip install pytest pytest-cov coveralls
         pip install -r requirements.txt
-    # - name: Install DeltaMetrics
-    #   run: |
-    #     python setup.py install
     - name: Test with pytest
       run: |
         python -m pytest --cov=deltametrics/ --cov-report=xml
     - name: Upload coverage to Codecov
-      uses: codecov/codecov-action@v1
+      uses: codecov/codecov-action@v3
       with:
         token: ${{ secrets.CODECOV_TOKEN }}
         file: ./coverage.xml
@@ -66,7 +63,7 @@ jobs:
         sudo apt update -y && sudo apt install -y latexmk texlive-latex-recommended texlive-latex-extra texlive-fonts-recommended dvipng
     - name: Install DeltaMetrics
       run: |
-        pip install
+        pip install .
     - name: Build and test documentation
       run: |
         (cd docs && make docs)