chore: regens API reference docs (#889)

diff --git a/docs/epy/googleapiclient._helpers-module.html b/docs/epy/googleapiclient._helpers-module.html
index f8561f2..6875375 100644
--- a/docs/epy/googleapiclient._helpers-module.html
+++ b/docs/epy/googleapiclient._helpers-module.html
@@ -178,21 +178,21 @@
     <td width="15%" align="right" valign="top" class="summary">
       <span class="summary-type">&nbsp;</span>
     </td><td class="summary">
-        <a name="POSITIONAL_WARNING"></a><span class="summary-name">POSITIONAL_WARNING</span> = <code title="'WARNING'">'WARNING'</code>
+        <a name="POSITIONAL_WARNING"></a><span class="summary-name">POSITIONAL_WARNING</span> = <code title="&quot;WARNING&quot;">&quot;WARNING&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="POSITIONAL_EXCEPTION"></a><span class="summary-name">POSITIONAL_EXCEPTION</span> = <code title="'EXCEPTION'">'EXCEPTION'</code>
+        <a name="POSITIONAL_EXCEPTION"></a><span class="summary-name">POSITIONAL_EXCEPTION</span> = <code title="&quot;EXCEPTION&quot;">&quot;EXCEPTION&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="POSITIONAL_IGNORE"></a><span class="summary-name">POSITIONAL_IGNORE</span> = <code title="'IGNORE'">'IGNORE'</code>
+        <a name="POSITIONAL_IGNORE"></a><span class="summary-name">POSITIONAL_IGNORE</span> = <code title="&quot;IGNORE&quot;">&quot;IGNORE&quot;</code>
     </td>
   </tr>
 <tr>
@@ -207,28 +207,28 @@
     <td width="15%" align="right" valign="top" class="summary">
       <span class="summary-type">&nbsp;</span>
     </td><td class="summary">
-        <a name="positional_parameters_enforcement"></a><span class="summary-name">positional_parameters_enforcement</span> = <code title="'WARNING'">'WARNING'</code>
+        <a name="positional_parameters_enforcement"></a><span class="summary-name">positional_parameters_enforcement</span> = <code title="&quot;WARNING&quot;">&quot;WARNING&quot;</code>
     </td>
   </tr>
 <tr class="private">
     <td width="15%" align="right" valign="top" class="summary">
       <span class="summary-type">&nbsp;</span>
     </td><td class="summary">
-        <a name="_SYM_LINK_MESSAGE"></a><span class="summary-name">_SYM_LINK_MESSAGE</span> = <code title="'File: {0}: Is a symbolic link.'">'File: {0}: Is a symbolic link.'</code>
+        <a name="_SYM_LINK_MESSAGE"></a><span class="summary-name">_SYM_LINK_MESSAGE</span> = <code title="&quot;File: {0}: Is a symbolic link.&quot;">&quot;File: {0}: Is a symbolic link.&quot;</code>
     </td>
   </tr>
 <tr class="private">
     <td width="15%" align="right" valign="top" class="summary">
       <span class="summary-type">&nbsp;</span>
     </td><td class="summary">
-        <a name="_IS_DIR_MESSAGE"></a><span class="summary-name">_IS_DIR_MESSAGE</span> = <code title="'{0}: Is a directory'">'{0}: Is a directory'</code>
+        <a name="_IS_DIR_MESSAGE"></a><span class="summary-name">_IS_DIR_MESSAGE</span> = <code title="&quot;{0}: Is a directory&quot;">&quot;{0}: Is a directory&quot;</code>
     </td>
   </tr>
 <tr class="private">
     <td width="15%" align="right" valign="top" class="summary">
       <span class="summary-type">&nbsp;</span>
     </td><td class="summary">
-        <a href="googleapiclient._helpers-module.html#_MISSING_FILE_MESSAGE" class="summary-name" onclick="show_private();">_MISSING_FILE_MESSAGE</a> = <code title="'Cannot access {0}: No such file or directory'">'Cannot access {0}: No such file or di<code class="variable-ellipsis">...</code></code>
+        <a href="googleapiclient._helpers-module.html#_MISSING_FILE_MESSAGE" class="summary-name" onclick="show_private();">_MISSING_FILE_MESSAGE</a> = <code title="&quot;Cannot access {0}: No such file or directory&quot;">&quot;Cannot access {0}: No such file or di<code class="variable-ellipsis">...</code></code>
     </td>
   </tr>
 </table>
@@ -492,7 +492,7 @@
   <dl class="fields">
     <dt>Value:</dt>
       <dd><table><tr><td><pre class="variable">
-'Cannot access {0}: No such file or directory'
+&quot;Cannot access {0}: No such file or directory&quot;
 </pre></td></tr></table>
 </dd>
   </dl>
@@ -525,7 +525,7 @@
 <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"