Commits on Oct 3, 2020

1. src/macros: Have labels! accept any type that implements Display …

   This allows (among other things) `histogram_opts!` to take the same kinds of
   types as `opts!`. E.g. to replace this:
   
   ```rust
   let status = String::from("200");
   histogram_opts!(
       ...
       labels! {"status".to_string() => status.clone()}
   )
   // Do more stuff with `status`.
   ```
   
   with this:
   
   ```rust
   let status = String::from("200");
   histogram_opts!(
       ...
       labels! {"status" => &status}
   )
   // Do more stuff with `status`.
   ```
   
   And a lot more, such as using numbers or enums as label values directly.
   
   Signed-off-by: Alin Sinpalean <alin.sinpalean@gmail.com>

   

   free committed Oct 3, 2020
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