Update INSTALL.md

INSTALL.md

@@ -5,6 +5,7 @@
 - torchvision from master
 - cocoapi
 - yacs
+- matplotlib
 - (optional) OpenCV for the webcam demo
 
 
@@ -12,7 +13,7 @@
 
 ```bash
 # maskrnn_benchmark and coco api dependencies
-pip install ninja yacs cython
+pip install ninja yacs cython matplotlib
 
 # follow PyTorch installation in https://pytorch.org/get-started/locally/
 # we give the instructions for CUDA 9.0