message: Unstable section of cargo/config.toml takes bools
diff: @@ -12,9 +12,9 @@ config file (`.cargo/config.toml`) in the `unstable` table. For example:
  ```toml
  [unstable]
  -mtime-on-use = 'yes'
  -multitarget = 'yes'
  -timings = 'yes'
  +mtime-on-use = true
  +multitarget = true
  +timings = true
  ```
  Some unstable features will require you to specify the `cargo-features` key in
  