ToSql can't be derived in structs with lifetimes

[CodeSandwich]

Example:

#[derive(ToSql)]
pub struct Dto<'a> {
    field: &'a str,
}

Error:

error[E0106]: missing lifetime specifier
 --> src/main.rs:9:10
  |
9 | #[derive(ToSql)]
  |          ^^^^^ expected lifetime parameter

[sfackler]

Should be doable to fix - in the next rust-postgres release we'll support borrowing during deserialization so we'll want to support it in FromSql as well.