chore: regens API reference docs (#889)

diff --git a/docs/epy/class-tree.html b/docs/epy/class-tree.html
index 60a7b3d..1ec6f45 100644
--- a/docs/epy/class-tree.html
+++ b/docs/epy/class-tree.html
@@ -163,7 +163,7 @@
 <table border="0" cellpadding="0" cellspacing="0" width="100%%">
   <tr>
     <td align="left" class="footer">
-    Generated by Epydoc 3.0.1 on Fri Jun 14 15:57:27 2019
+    Generated by Epydoc 3.0.1 on Thu Apr 30 17:06:05 2020
     </td>
     <td align="right" class="footer">
       <a target="mainFrame" href="http://epydoc.sourceforge.net"