README.md in wicked_pdf-1.3.0 vs README.md in wicked_pdf-1.4.0

@@ -188,9 +188,11 @@
                background:                     false,                     # background needs to be true to enable background colors to render
                no_background:                  true,
                viewport_size:                  'TEXT',                    # available only with use_xserver or patched QT
                extra:                          '',                        # directly inserted into the command to wkhtmltopdf
                raise_on_all_errors:            nil,                       # raise error for any stderr output.  Such as missing media, image assets
+               log_level:                      'info',                    # Available values: none, error, warn, or info - only available with wkhtmltopdf 0.12.5+
+               quiet:                          false,                     # `false` is same as `log_level: 'info'`, `true` is same as `log_level: 'none'`
                outline: {   outline:           true,
                             outline_depth:     LEVEL },
                margin:  {   top:               SIZE,                     # default 10 (mm)
                             bottom:            SIZE,
                             left:              SIZE,