v0.1.16

v0.1.16

• support impl_scan! macro
  for example:

use cdbc::{impl_scan};
use cdbc::scan::{Scan,Scans};
 pub struct BizActivity {
     pub id: Option<String>,
     pub name: Option<String>,
     pub delete_flag: Option<i32>,
 }
 impl_scan!(SqliteRow,BizActivity{id:None,name:None,delete_flag:None});

 let v:Vec<BizActivity > = query!("select * from biz_activity limit 1").fetch_all(pool)?.scan()?;