message: readme: re-word usage to remove version number
  We cheat a little bit by leveraging 'cargo add'.
  Closes
diff: @@ -23,12 +23,8 @@ can be found on the
  ### Usage
  -Add this to your `Cargo.toml`:
  -
  -```toml
  -[dependencies]
  -regex = "1.5"
  -```
  +To bring this crate into your repository, either add `regex` to your
  +`Cargo.toml`, or run `cargo add regex`.
  Here's a simple example that matches a date in YYYY-MM-DD format and prints the
  year, month and day:
  