message: Make Cargo.toml a bit cleaner
diff: @@ -33,27 +33,11 @@ byteorder = "1.2.1"
  num-iter = "0.1.32"
  num-rational = { version = "0.2.1", default-features = false }
  num-traits = "0.2.0"
  -
  -[dependencies.gif]
  -version = "0.10.0"
  -optional = true
  -
  -[dependencies.jpeg-decoder]
  -version = "0.1"
  -default-features = false
  -optional = true
  -
  -[dependencies.png]
  -version = "0.15"
  -optional = true
  -
  -[dependencies.scoped_threadpool]
  -version = "0.1"
  -optional = true
  -
  -[dependencies.tiff]
  -version = "0.4.0"
  -optional = true
  +gif = { version = "0.10.0", optional = true }
  +jpeg-decoder = { version = "0.1", default-features = false, optional = true }
  +png = { version = "0.15", optional = true }
  +scoped_threadpool = { version = "0.1", optional = true }
  +tiff = { version = "0.4.0", optional = true }
  [dev-dependencies]
  crc32fast = "1.2.0"
  