Release v1.6.0 (#324)

* Update version and changelog for v1.6.0
* Update docs
diff --git a/docs/dyn/androidpublisher_v2.purchases.html b/docs/dyn/androidpublisher_v2.purchases.html
index 9acea14..4865e46 100644
--- a/docs/dyn/androidpublisher_v2.purchases.html
+++ b/docs/dyn/androidpublisher_v2.purchases.html
@@ -84,4 +84,9 @@
 </p>
 <p class="firstline">Returns the subscriptions Resource.</p>
 
+<p class="toc_element">
+  <code><a href="androidpublisher_v2.purchases.voidedpurchases.html">voidedpurchases()</a></code>
+</p>
+<p class="firstline">Returns the voidedpurchases Resource.</p>
+
 </body></html>
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