doc update

Author: jeremydaly

README.md

@@ -381,6 +381,7 @@ For more control over an attribute's behavior, you can specify an object as the
 | default  | *same as* `type` or `function` | all | Specifies a default value (if none provided) when using `put` or `update`. This also supports functions for creating custom default. See more below.  |
 | dependsOn  | `string` or `array` of `string`s | all | Creates a dependency graph for default values. For example, if the attribute uses a default value that requires another attribute's default value, this will ensure dependent attributes' default values are calcuated first.  |
 | onUpdate  | `boolean` | all | Forces `default` values to be passed on every `update`. |
+| save  | `boolean` | all | Specifies whether this attribute should be saved to the table. Defaults to `true`. |
 | hidden  | `boolean` | all | Hides attribute from returned JavaScript object when auto-parsing is enabled or when using the `parse` method. |
 | required  | `boolean` or "always" | all | Specifies whether an attribute is required. A value of `true` requires the attribute for all `put` operations. A `string` value of "always" requires the attribute for `put` *and* `update` operations. |
 | alias  | `string` | all | Adds a bidirectional alias to the attribute. All input methods can use either the attribute name or the alias when passing in data. Auto-parsing and the `parse` method will map attributes to their alias. |