Updated CI

.github/workflows/build.yml

@@ -32,16 +32,14 @@ jobs:
       with:
         path: ~/.pio/libdeps
         key: ${{ runner.os }}-pio-${{ hashFiles('platformio.ini') }}
-    - name: Set up Python 3.7
+    - name: Set up Python 3.9
       uses: actions/setup-python@v1
       with:
-        python-version: 3.7
+        python-version: 3.9
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
         pip install -U platformio css_html_js_minify
-    - name: Configure build targets
-      run: echo "[platformio]\ndefault_envs = esp8266, esp32" > platformio-user.ini
     - name: PlatformIO lib install
       run: pio lib install
     - name: PlatformIO run