Migrate lazy_static to once_cell, less macro magic and slightly faster

src/main.rs

@@ -16,8 +16,6 @@ extern crate diesel;
 #[macro_use]
 extern crate diesel_migrations;
 #[macro_use]
-extern crate lazy_static;
-#[macro_use]
 extern crate derive_more;
 #[macro_use]
 extern crate num_derive;