Minor fixes

Author: ivankravets

.github/workflows/examples.yml

@@ -43,4 +43,4 @@ jobs:
           pio pkg install --global --platform symlink://.
       - name: Build examples
         run: |
-          platformio run -d ${{ matrix.example }}
+          pio run -d ${{ matrix.example }}

platform.py

@@ -19,7 +19,7 @@
 import re
 import requests
 
-from platformio.managers.platform import PlatformBase, to_unix_path
+from platformio.public import PlatformBase, to_unix_path
 
 
 IS_WINDOWS = sys.platform.startswith("win")