Note black, pygbif in doc

README.md

@@ -52,13 +52,29 @@ Such as:
 {"snark": "foo"}
 ```
 
+# Development
+To "develop", install the requirements:
 
-# GBIF
+```
+pip install -r requirements-dev.txt
+```
+
+Then run black on the Python files for nice formatting:
+
+```
+black gbif-cruft*
+```
+
+
+# Upstream
+## GBIF
 The main upstream project is the
 Global Biodiversity Information Facility:
-
 * https://www.gbif.org/
 
+pygbif:
+* https://github.com/gbif/pygbif
+
 
 # Copyright
 Unofficial project, not related to the