changes made to mq3 MD file for cover image

Author: das1396

MQ3 Sensor with Arduino/README.md

@@ -1,6 +1,6 @@
 # [Interfacing 16x2 LCD with Arduino](https://circuitdigest.com/microcontroller-projects/interfacing-16x2-lcd-with-arduino)
 
-<img src="https://github.com/Circuit-Digest/Basic-Arduino-Tutorials-for-Beginners-/blob/d72d720d083c663016516b760d49e7d76e152fe6/Interfacing%2016x2%20LCD%20with%20Arduino/Image/16x2-LCD_Title-image.jpg" width="" alt="alt_text" title="image_tooltip">
+<img src="https://github.com/Circuit-Digest/Basic-Arduino-Tutorials-for-Beginners-/blob/main/MQ3%20Sensor%20with%20Arduino/images/MQ-Gas-sensor_title.jpg" width="" alt="alt_text" title="image_tooltip">
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