Add intersphinx mappings for Python to prevent spurious nitpicky failures. Fixes jaraco/skeleton#51.

Author: jaraco

docs/conf.py

@@ -27,3 +27,10 @@
 
 # Be strict about any broken references:
 nitpicky = True
+
+# Include Python intersphinx mapping to prevent failures
+# jaraco/skeleton#51
+extensions += ['sphinx.ext.intersphinx']
+intersphinx_mapping = {
+    'python': ('https://docs.python.org/3', None),
+}