DOC: document changing font cache to json

tacaswell · tacaswell · commit 6f273172c54d · 2017-10-02T01:12:51.000-07:00
diff --git a/doc/api/api_changes.rst b/doc/api/api_changes.rst
@@ -290,6 +290,10 @@ now uses 'mask' as the default method to handle invalid values (as opposed to
 
 Previously they were clipped to a very small number and shown.
 
+Font cache as json
+------------------
+
+The font cache is now saved as json, rather than a pickle.
 
 Code Removal
 ------------
