derivation does not work without importing Template

[ubnt-intrepid]

From Rust 1.30, it is possible to specify the path directly in #[derive()]. Unfortunately, this notation does not work as the derived code assumes that Template is imported at the current module:

extern crate askama;

#[derive(askama::Template)]
#[template(source = "foo", ext = "txt")]
struct Template {}

   Compiling askama1 v0.1.0 (/home/ubnt-intrepid/askama1)
error[E0599]: no method named `render_into` found for type `&Template` in the current scope
 --> src/lib.rs:3:10
  |
3 | #[derive(askama::Template)]
  |          ^^^^^^^^^^^^^^^^
  |
  = help: items from traits can only be used if the trait is in scope
help: the following trait is implemented but not in scope, perhaps add a `use` for it:
  |
4 | use askama::Template;
  |

error: aborting due to previous error

For more information about this error, try `rustc --explain E0599`.
error: Could not compile `askama1`.

To learn more, run the command again with --verbose.

[djc]

Thanks for fixing this!