Embedded migrations: Dead code warning

[dbrgn]

As mentioned here #854 (comment), using embedded migrations with run_with_output results in a dead code warning.

warning: function is never used: `run`, #[warn(dead_code)] on by default
  --> src/db/mod.rs:62:1
   |
62 | embed_migrations!();
   | ^^^^^^^^^^^^^^^^^^^^
   |
   = note: this error originates in a macro outside of the current crate

Would it be possible to add an exception for that? I didn't easily find out where to add it.

CC @Eijebong @weiznich

[killercup]

Yes, add #[allow(unused)] to the mods here.

[dbrgn]

@killercup Ok, I'll create a pull request :)