Move to pip API.

.github/workflows/build_and_publish.yml

@@ -29,18 +29,16 @@ jobs:
       with:
         python-version: ${{ matrix.python-version }}
 
-    - uses: actions/cache@v1
-      if: startsWith(runner.os, 'Linux')
-      with:
-        path: ~/.cache/pip
-        key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt') }}
-        restore-keys: |
-          ${{ runner.os }}-pip-
+    - name: Get pip cache dir
+      id: pip-cache
+      run: |
+        python -m pip install --upgrade pip setuptools wheel
+        echo "::set-output name=dir::$(pip cache dir)"
 
-    - uses: actions/cache@v1
-      if: startsWith(runner.os, 'macOS')
+    - name: Pip cache
+      uses: actions/cache@v1
       with:
-        path: ~/Library/Caches/pip
+        path: ${{ steps.pip-cache.outputs.dir }}
         key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt') }}
         restore-keys: |
           ${{ runner.os }}-pip-
@@ -57,7 +55,6 @@ jobs:
         brew install autoconf automake libtool pkg-config
     - name: Installing package dependencies
       run: |
-        python -m pip install --upgrade pip setuptools wheel
         pip install wheel twine setuptools codecov
         pip install -r requirements.txt
         python setup.py bdist_wheel