Update README.md (#508)

Author: TekayaNidham

README.md

@@ -101,7 +101,7 @@ You need to choose the target layer to compute CAM for.
 Some common choices are:
 - FasterRCNN: model.backbone
 - Resnet18 and 50: model.layer4[-1]
-- VGG and densenet161: model.features[-1]
+- VGG, densenet161 and mobilenet: model.features[-1]
 - mnasnet1_0: model.layers[-1]
 - ViT: model.blocks[-1].norm1
 - SwinT: model.layers[-1].blocks[-1].norm1