message: Bump required png version to 0.16.5
diff: @@ -28,7 +28,7 @@ num-rational = { version = "0.2.1", default-features = false }
  num-traits = "0.2.0"
  gif = { version = "0.10.0", optional = true }
  jpeg = { package = "jpeg-decoder", version = "0.1.17", default-features = false, optional = true }
  -png = { version = "0.16.0", optional = true }
  +png = { version = "0.16.5", optional = true }
  scoped_threadpool = { version = "0.1", optional = true }
  tiff = { version = "0.5.0", optional = true }
  