update intersphinx mappings (#1232)

Author: wholmgren

docs/sphinx/source/conf.py

@@ -314,9 +314,11 @@ def setup(app):
 
 # Example configuration for intersphinx: refer to the Python standard library.
 intersphinx_mapping = {
-    'python': ('https://docs.python.org/3.8/', None),
-    'pandas': ('https://pandas.pydata.org/pandas-docs/stable/', None),
-    'numpy': ('https://docs.scipy.org/doc/numpy/', None),
+    'python': ('https://docs.python.org/3/', None),
+    'numpy': ('https://numpy.org/doc/stable/', None),
+    'scipy': ('https://docs.scipy.org/doc/scipy/reference/', None),
+    'pandas': ('https://pandas.pydata.org/pandas-docs/stable', None),
+    'matplotlib': ('https://matplotlib.org/stable', None),
 }
 
 nbsphinx_allow_errors = True