chore: regens API reference docs (#889)

diff --git a/docs/epy/googleapiclient.model.ProtocolBufferModel-class.html b/docs/epy/googleapiclient.model.ProtocolBufferModel-class.html
index 8e9971f..d684a65 100644
--- a/docs/epy/googleapiclient.model.ProtocolBufferModel-class.html
+++ b/docs/epy/googleapiclient.model.ProtocolBufferModel-class.html
@@ -58,22 +58,7 @@
 <!-- ==================== CLASS DESCRIPTION ==================== -->
 <h1 class="epydoc">Class ProtocolBufferModel</h1><p class="nomargin-top"><span class="codelink"><a href="googleapiclient.model-pysrc.html#ProtocolBufferModel">source&nbsp;code</a></span></p>
 <center>
-<center>  <map id="uml_class_diagram_for_googleap_42" name="uml_class_diagram_for_googleap_42">
-<area shape="rect" id="node1_9" href="googleapiclient.model.ProtocolBufferModel-class.html#accept" title="googleapiclient.model.ProtocolBufferModel.accept" alt="" coords="119,189,293,209"/>
-<area shape="rect" id="node1_10" href="googleapiclient.model.ProtocolBufferModel-class.html#content_type" title="googleapiclient.model.ProtocolBufferModel.content_type" alt="" coords="119,209,293,229"/>
-<area shape="rect" id="node1_11" href="googleapiclient.model.ProtocolBufferModel-class.html#alt_param" title="googleapiclient.model.ProtocolBufferModel.alt_param" alt="" coords="119,229,293,249"/>
-<area shape="rect" id="node1_12" href="googleapiclient.model.ProtocolBufferModel-class.html#__init__" title="Constructs a ProtocolBufferModel." alt="" coords="119,252,293,272"/>
-<area shape="rect" id="node1_13" href="googleapiclient.model.ProtocolBufferModel-class.html#serialize" title="Perform the actual Python object serialization." alt="" coords="119,272,293,292"/>
-<area shape="rect" id="node1_14" href="googleapiclient.model.ProtocolBufferModel-class.html#deserialize" title="Perform the actual deserialization from response string to Python object." alt="" coords="119,292,293,312"/>
-<area shape="rect" id="node1_15" href="googleapiclient.model.ProtocolBufferModel-class.html#no_content_response" title="googleapiclient.model.ProtocolBufferModel.no_content_response" alt="" coords="119,312,293,332"/>
-<area shape="rect" id="node1" href="googleapiclient.model.ProtocolBufferModel-class.html" title="Model class for protocol buffers." alt="" coords="106,165,305,339"/>
-<area shape="rect" id="node2_16" href="googleapiclient.model.BaseModel-class.html#request" title="Updates outgoing requests with a serialized body." alt="" coords="17,101,396,121"/>
-<area shape="rect" id="node2_17" href="googleapiclient.model.BaseModel-class.html#response" title="Convert the response wire format into a Python object." alt="" coords="17,121,396,141"/>
-<area shape="rect" id="node2" href="googleapiclient.model.BaseModel-class.html" title="Base model class." alt="" coords="5,68,408,147"/>
-<area shape="rect" id="node3" href="googleapiclient.model.Model-class.html" title="Model base class." alt="" coords="175,5,235,49"/>
-</map>
-  <img src="uml_class_diagram_for_googleap_42.gif" alt='' usemap="#uml_class_diagram_for_googleap_42" ismap="ismap" class="graph-without-title" />
-</center>
+
 </center>
 <hr />
 <pre class="literalblock">
@@ -221,21 +206,21 @@
     <td width="15%" align="right" valign="top" class="summary">
       <span class="summary-type">&nbsp;</span>
     </td><td class="summary">
-        <a name="accept"></a><span class="summary-name">accept</span> = <code title="'application/x-protobuf'">'application/x-protobuf'</code>
+        <a name="accept"></a><span class="summary-name">accept</span> = <code title="&quot;application/x-protobuf&quot;">&quot;application/x-protobuf&quot;</code>
     </td>
   </tr>
 <tr>
     <td width="15%" align="right" valign="top" class="summary">
       <span class="summary-type">&nbsp;</span>
     </td><td class="summary">
-        <a name="content_type"></a><span class="summary-name">content_type</span> = <code title="'application/x-protobuf'">'application/x-protobuf'</code>
+        <a name="content_type"></a><span class="summary-name">content_type</span> = <code title="&quot;application/x-protobuf&quot;">&quot;application/x-protobuf&quot;</code>
     </td>
   </tr>
 <tr>
     <td width="15%" align="right" valign="top" class="summary">
       <span class="summary-type">&nbsp;</span>
     </td><td class="summary">
-        <a name="alt_param"></a><span class="summary-name">alt_param</span> = <code title="'proto'">'proto'</code>
+        <a name="alt_param"></a><span class="summary-name">alt_param</span> = <code title="&quot;proto&quot;">&quot;proto&quot;</code>
     </td>
   </tr>
 </table>
@@ -301,7 +286,7 @@
   <pre class="literalblock">
 Constructs a ProtocolBufferModel.
 
-The serialzed protocol buffer returned in an HTTP response will be
+The serialized protocol buffer returned in an HTTP response will be
 de-serialized using the given protocol buffer class.
 
 Args:
@@ -436,7 +421,7 @@
 <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"