added keyword to jspg

src/schema.rs

@@ -35,6 +35,9 @@ pub struct SchemaObject {
   pub pattern_properties: Option<BTreeMap<String, Arc<Schema>>>,
   #[serde(rename = "additionalProperties")]
   pub additional_properties: Option<Arc<Schema>>,
+  #[serde(rename = "$family")]
+  pub family: Option<String>,
+
   pub required: Option<Vec<String>>,
 
   // dependencies can be schema dependencies or property dependencies