Release v1.6.0 (#324)

* Update version and changelog for v1.6.0
* Update docs
diff --git a/docs/dyn/androidpublisher_v2.edits.expansionfiles.html b/docs/dyn/androidpublisher_v2.edits.expansionfiles.html
index 117b9df..05358d0 100644
--- a/docs/dyn/androidpublisher_v2.edits.expansionfiles.html
+++ b/docs/dyn/androidpublisher_v2.edits.expansionfiles.html
@@ -84,7 +84,7 @@
   <code><a href="#update">update(packageName, editId, apkVersionCode, expansionFileType, body)</a></code></p>
 <p class="firstline">Updates the APK's Expansion File configuration to reference another APK's Expansion Files. To add a new Expansion File use the Upload method.</p>
 <p class="toc_element">
-  <code><a href="#upload">upload(packageName, editId, apkVersionCode, expansionFileType, media_body=None)</a></code></p>
+  <code><a href="#upload">upload(packageName, editId, apkVersionCode, expansionFileType, media_body=None, media_mime_type=None)</a></code></p>
 <p class="firstline">Uploads and attaches a new Expansion File to the APK specified.</p>
 <h3>Method Details</h3>
 <div class="method">
@@ -170,7 +170,7 @@
 </div>
 
 <div class="method">
-    <code class="details" id="upload">upload(packageName, editId, apkVersionCode, expansionFileType, media_body=None)</code>
+    <code class="details" id="upload">upload(packageName, editId, apkVersionCode, expansionFileType, media_body=None, media_mime_type=None)</code>
   <pre>Uploads and attaches a new Expansion File to the APK specified.
 
 Args:
@@ -182,6 +182,7 @@
       main - 
       patch - 
   media_body: string, The filename of the media request body, or an instance of a MediaUpload object.
+  media_mime_type: string, The MIME type of the media request body, or an instance of a MediaUpload object.
 
 Returns:
   An object of the form: