MPAE-16817: updated fvr image

Author: Diana Loles

README.md

@@ -68,7 +68,7 @@ The following configurations must be made for this project:
   - FVR buffer gain to ADC: 1x
   - FVR buffer gain to other peripherals: 1x
 
-  <br><img src="images/FVR.PNG" width="600">
+  <br><img src="images/FVR.png" width="600">
 
 - ADCC:
   - Enable ADC: Yes