Release v1.6.0 (#324)

* Update version and changelog for v1.6.0
* Update docs
diff --git a/docs/dyn/androidpublisher_v2.edits.images.html b/docs/dyn/androidpublisher_v2.edits.images.html
index 5d4a27f..c4e2557 100644
--- a/docs/dyn/androidpublisher_v2.edits.images.html
+++ b/docs/dyn/androidpublisher_v2.edits.images.html
@@ -84,7 +84,7 @@
   <code><a href="#list">list(packageName, editId, language, imageType)</a></code></p>
 <p class="firstline">Lists all images for the specified language and image type.</p>
 <p class="toc_element">
-  <code><a href="#upload">upload(packageName, editId, language, imageType, media_body=None)</a></code></p>
+  <code><a href="#upload">upload(packageName, editId, language, imageType, media_body=None, media_mime_type=None)</a></code></p>
 <p class="firstline">Uploads a new image and adds it to the list of images for the specified language and image type.</p>
 <h3>Method Details</h3>
 <div class="method">
@@ -179,7 +179,7 @@
 </div>
 
 <div class="method">
-    <code class="details" id="upload">upload(packageName, editId, language, imageType, media_body=None)</code>
+    <code class="details" id="upload">upload(packageName, editId, language, imageType, media_body=None, media_mime_type=None)</code>
   <pre>Uploads a new image and adds it to the list of images for the specified language and image type.
 
 Args:
@@ -198,6 +198,7 @@
       tvScreenshots - 
       wearScreenshots - 
   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: