Update README.md

README.md

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 NOTE: reboots if no sd card present and the LED stays on full all the time with latest esp32 board manager.  I am using version  1.0.6<br>
       known bug: https://github.com/espressif/arduino-esp32/issues/5195<br><br>
       
-<h1>ESP32Cam-demo sketch for use with the Arduino IDE</h1>
+<h1>ESP32Cam-demo sketch for use with the Arduino IDE or PlatformIO</h1>
 <p align="center"><img src="/images/esp32cam.jpeg" width="80%"/></p>
 
 This can be used as a starting point sketch for projects using the esp32cam development board,