message: udpate description
diff: @@ -5,7 +5,7 @@ authors = ["Tock Project Developers <tock-dev@googlegroups.com>"]
  license = "MIT/Apache-2.0"
  edition = "2018"
  repository = "https://www.github.com/tock/libtock-rs"
  -description = "libtock leds driver"
  +description = "libtock buttons driver"
  [dependencies]
  libtock_platform = { path = "../../platform" }
  