added extra Pillow instructions to README

README.md

@@ -8,6 +8,14 @@ _no ragrets_
 ```
 python -m venv .venv
 source .venv/bin/activate
-pip install -r requirements.txt
+pip install --no-binary=Pillow -r requirements.txt
 python sniffpest.py
-```
+```
+
+### i get a "munmap" error????
+you probably left out the `--no-binary=Pillow` bit above.
+to fix:
+```
+pip uninstall Pillow
+pip install --no-binary=Pillow Pillow
+```

requirements.txt

@@ -1,13 +1,11 @@
 arcade==2.4.3
 attrs==20.3.0
 cffi==1.14.3
-flake8==3.8.4
 mccabe==0.6.1
 numpy==1.19.4
 Pillow==8.0.1
 pycodestyle==2.6.0
 pycparser==2.20
-pyflakes==2.2.0
 pyglet==1.5.9
 pymunk==5.7.0
 pytiled-parser==0.9.4a3