femme is not just a dev dep anymore

[jbr]

master is currently broken in the following way:

although cargo test and cargo build work just fine, a project created like

cargo new tide-example --bin
cd tide-example
cargo add tide --git=https://github.com/http-rs/tide.git
cargo build

results in this compile error

 error[E0277]: the trait bound `std::string::String: log::kv::value::ToValue` is not satisfied
   --> /Users/jbr/.cargo/git/checkouts/tide-ea61fd839c4268c0/f575a12/src/server.rs:302:21
    |
302 |                     log::error!("async-h1 error", { error: err.to_string() });
    |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `log::kv::value::ToValue` is not implemented for `std::string::String`
    |
    = note: required for the cast to the object type `dyn log::kv::value::ToValue`
    = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)

error: aborting due to previous error

For more information about this error, try `rustc --explain E0277`.
error: could not compile `tide`.

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

Adding this change to tide's dependencies fixes the issue. As of ee5f05e#diff-4ce93534efc34e923ce01e975eb7ed80R302 tide seems to need femme to compile.

[yoshuawuyts]

Oh? I didn't realize it wasn't just a dev dep. Sure, let's merge this (: