Update docs for 1.4.1 release
diff --git a/docs/dyn/books_v1.onboarding.html b/docs/dyn/books_v1.onboarding.html
index edcb037..6279bf9 100644
--- a/docs/dyn/books_v1.onboarding.html
+++ b/docs/dyn/books_v1.onboarding.html
@@ -78,7 +78,7 @@
   <code><a href="#listCategories">listCategories(locale=None)</a></code></p>
 <p class="firstline">List categories for onboarding experience.</p>
 <p class="toc_element">
-  <code><a href="#listCategoryVolumes">listCategoryVolumes(pageSize=None, pageToken=None, locale=None, categoryId=None)</a></code></p>
+  <code><a href="#listCategoryVolumes">listCategoryVolumes(pageSize=None, pageToken=None, locale=None, maxAllowedMaturityRating=None, categoryId=None)</a></code></p>
 <p class="firstline">List available volumes under categories for onboarding experience.</p>
 <p class="toc_element">
   <code><a href="#listCategoryVolumes_next">listCategoryVolumes_next(previous_request, previous_response)</a></code></p>
@@ -107,13 +107,17 @@
 </div>
 
 <div class="method">
-    <code class="details" id="listCategoryVolumes">listCategoryVolumes(pageSize=None, pageToken=None, locale=None, categoryId=None)</code>
+    <code class="details" id="listCategoryVolumes">listCategoryVolumes(pageSize=None, pageToken=None, locale=None, maxAllowedMaturityRating=None, categoryId=None)</code>
   <pre>List available volumes under categories for onboarding experience.
 
 Args:
   pageSize: integer, Number of maximum results per page to be included in the response.
   pageToken: string, The value of the nextToken from the previous page.
   locale: string, ISO-639-1 language and ISO-3166-1 country code. Default is en-US if unset.
+  maxAllowedMaturityRating: string, The maximum allowed maturity rating of returned volumes. Books with a higher maturity rating are filtered out.
+    Allowed values
+      mature - Show books which are rated mature or lower.
+      not-mature - Show books which are rated not mature.
   categoryId: string, List of category ids requested. (repeated)
 
 Returns:
@@ -235,9 +239,11 @@
           "publisher": "A String", # Publisher of this volume. (In LITE projection.)
           "language": "A String", # Best language for this volume (based on content). It is the two-letter ISO 639-1 code such as 'fr', 'en', etc.
           "readingModes": "", # The reading modes available for this volume.
+          "allowAnonLogging": True or False, # Whether anonymous logging should be allowed.
           "title": "A String", # Volume title. (In LITE projection.)
           "printType": "A String", # Type of publication of this volume. Possible values are BOOK or MAGAZINE.
           "samplePageCount": 42, # Total number of sample pages as per publisher metadata.
+          "maturityRating": "A String",
           "printedPageCount": 42, # Total number of printed pages in generated pdf representation.
           "averageRating": 3.14, # The mean review rating for this volume. (min = 1.0, max = 5.0)
           "infoLink": "A String", # URL to view information about this volume on the Google Books site. (In LITE projection)