Update captum dependencies (matplotlib and flask-compress)

Author: QasimKhan5x

beginner_source/introyt/captumyt.py

@@ -98,21 +98,24 @@
 Before you get started, you need to have a Python environment with:
 
 -  Python version 3.6 or higher
--  For the Captum Insights example, Flask 1.1 or higher
+-  For the Captum Insights example, Flask 1.1 or higher and Flask-Compress
+   (the latest version is recommended)
 -  PyTorch version 1.2 or higher (the latest version is recommended)
 -  TorchVision version 0.6 or higher (the latest version is recommended)
 -  Captum (the latest version is recommended)
+-  Matplotlib version 3.3.4, since Captum currently uses a Matplotlib
+   function whose arguments have been renamed in later versions
 
 To install Captum in an Anaconda or pip virtual environment, use the
 appropriate command for your environment below:
 
 With ``conda``::
 
-    conda install pytorch torchvision captum -c pytorch
+    conda install pytorch torchvision captum flask-compress matplotlib=3.3.4 -c pytorch
 
 With ``pip``::
 
-    pip install torch torchvision captum
+    pip install torch torchvision captum matplotlib==3.3.4 Flask-Compress
 
 Restart this notebook in the environment you set up, and you’re ready to
 go!