updated installation instructions

README.md

@@ -18,3 +18,28 @@ A quick example:
 Please see [the documentation](https://pincelate.readthedocs.io/en/latest/) for
 more information!
 
+I also did [a series of tutorials on Pincelate for PyCon
+2020](https://github.com/aparrish/nonsense-verse-pycon-2020).
+
+## Installation
+
+Machine learning moves fast and breaks things, including backwards
+compatibility with models like this. So installation is a bit tricky. You'll
+need to install *particular versions* of Tensorflow and Keras to get Pincelate
+to work. (For this reason, I highly recommend installing Pincelate in a virtual
+environment or conda environment.)
+
+This should do the trick:
+
+    pip install tensorflow==1.15.0 keras==2.2.5 "h5py<3.0.0"
+
+After you've done this, you can install Pincelate:
+
+    pip install pincelate
+
+This will install the code and the pre-trained model.
+
+Pincelate requires *Python 3.6* or later. (It might work on other versions, but
+I haven't tested it.) As of this writing, Python 3.8 and later are not yet
+supported (because of incompatibilities in some of the required libraries).
+