FromSql trait is private

[Cheburum]

To my mind it is better to have public FromSql trait. Sometimes there is a need to write generics like this:

fn get_db_column<T>(column_name: &str, query: &str) -> Vec<T>
where T: Send + FromSql
{
        let mut runtime = tokio::runtime::Runtime::new()
                                   .expect("Unable to create a runtime");
        let pool = Pool::new(get_clickhouse_addr());

        let done = pool
            .get_handle()
            .and_then(move |c| c.query(query).fetch_all())
            .and_then(move |(_, block)| {
                let mut column_vec = vec!();

                for row in block.rows() {
                    let item: T = row.get(column_name)
                ...

[suharev7]

Thanks for the advice it's quite reasonable. Here is a commit to implementing this and I will publish it with the next version.