Update docs for 1.4.1 release
diff --git a/docs/dyn/books_v1.volumes.html b/docs/dyn/books_v1.volumes.html
index b84632d..962614d 100644
--- a/docs/dyn/books_v1.volumes.html
+++ b/docs/dyn/books_v1.volumes.html
@@ -232,9 +232,11 @@
       "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)
@@ -462,9 +464,11 @@
           "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)