Moved delete into action module.

src/action.rs

@@ -1,6 +1,7 @@
 mod action_type;
 mod addition;
 mod calculation;
+mod delete;
 mod message;
 mod query;
 mod reply;
@@ -12,6 +13,7 @@ pub use crate::document::{DocDef, Field, FieldType, Records};
 pub use action_type::Action;
 pub use addition::Addition;
 pub use calculation::{CalcValue, Calculation, Operand};
+pub use delete::Delete;
 pub use message::MsgAction;
 pub use query::Query;
 pub use reply::Reply;