Update chunky_png 1.3.1 -> 1.3.3, oily_png 1.1.1 -> 1.1.2

chunky_png:

  https://github.com/wvanbergen/chunky_png/compare/928dddadeb2e89e99ea95b014b68877effc5544d...e92a9a6499e426e5c6dcfdabddb83c2ad4052ed8

oily_png:

  https://github.com/wvanbergen/oily_png/compare/6593e57acc2e5a91601fb3eed0fa4b492ab92e70...0037c4bb0fcd9e1f64527f410ae0c90bae707e52