message: Add [[bench]] details
diff: @@ -11,6 +11,13 @@ repository = "https://github.com/rust-num/num-bigint"
  version = "0.1.41"
  readme = "README.md"
  +[[bench]]
  +name = "bigint"
  +
  +[[bench]]
  +harness = false
  +name = "shootout-pidigits"
  +
  [dependencies]
  [dependencies.num-integer]
  