chore: regens API reference docs (#889)

diff --git a/docs/epy/googleapiclient.http._StreamSlice-class.html b/docs/epy/googleapiclient.http._StreamSlice-class.html
index d26da09..7b450a3 100644
--- a/docs/epy/googleapiclient.http._StreamSlice-class.html
+++ b/docs/epy/googleapiclient.http._StreamSlice-class.html
@@ -58,13 +58,7 @@
 <!-- ==================== CLASS DESCRIPTION ==================== -->
 <h1 class="epydoc">Class _StreamSlice</h1><p class="nomargin-top"><span class="codelink"><a href="googleapiclient.http-pysrc.html#_StreamSlice">source&nbsp;code</a></span></p>
 <center>
-<center>  <map id="uml_class_diagram_for_googleap_37" name="uml_class_diagram_for_googleap_37">
-<area shape="rect" id="node1_2" href="googleapiclient.http._StreamSlice-class.html#__init__" title="Constructor." alt="" coords="17,38,252,58"/>
-<area shape="rect" id="node1_3" href="googleapiclient.http._StreamSlice-class.html#read" title="Read n bytes." alt="" coords="17,58,252,78"/>
-<area shape="rect" id="node1" href="googleapiclient.http._StreamSlice-class.html" title="Truncated stream." alt="" coords="5,5,264,84"/>
-</map>
-  <img src="uml_class_diagram_for_googleap_37.gif" alt='' usemap="#uml_class_diagram_for_googleap_37" ismap="ismap" class="graph-without-title" />
-</center>
+
 </center>
 <hr />
 <pre class="literalblock">
@@ -285,7 +279,7 @@
 <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 15:57:28 2019
+    Generated by Epydoc 3.0.1 on Thu Apr 30 17:06:06 2020
     </td>
     <td align="right" class="footer">
       <a target="mainFrame" href="http://epydoc.sourceforge.net"