Update CONTRIBUTING.md

sobolevn · web-flow · commit 44f5971cd4d4 · 2019-12-11T15:47:31.000+03:00
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
@@ -13,6 +13,7 @@ Here are some practical examples of what we are doing here:
 
 - https://medium.com/@rnesytov/using-Result-monad-in-python-b6eac698dff5
 - https://www.morozov.is/2018/09/08/monad-laws-in-ruby.html
+- https://beepb00p.xyz/mypy-error-handling.html
 
 
 ## Dependencies
