Release v1.6.0 (#324)

* Update version and changelog for v1.6.0
* Update docs
diff --git a/docs/dyn/compute_beta.html b/docs/dyn/compute_beta.html
index 025623f..00a78a4 100644
--- a/docs/dyn/compute_beta.html
+++ b/docs/dyn/compute_beta.html
@@ -85,6 +85,11 @@
 <p class="firstline">Returns the autoscalers Resource.</p>
 
 <p class="toc_element">
+  <code><a href="compute_beta.backendBuckets.html">backendBuckets()</a></code>
+</p>
+<p class="firstline">Returns the backendBuckets Resource.</p>
+
+<p class="toc_element">
   <code><a href="compute_beta.backendServices.html">backendServices()</a></code>
 </p>
 <p class="firstline">Returns the backendServices Resource.</p>