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diff --git a/vendor/png/src/lib.rs b/vendor/png/src/lib.rs
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+//! # PNG encoder and decoder
+//!
+//! This crate contains a PNG encoder and decoder. It supports reading of single lines or whole frames.
+//!
+//! ## The decoder
+//!
+//! The most important types for decoding purposes are [`Decoder`](struct.Decoder.html) and
+//! [`Reader`](struct.Reader.html). They both wrap a `std::io::Read`.
+//! `Decoder` serves as a builder for `Reader`. Calling `Decoder::read_info` reads from the `Read` until the
+//! image data is reached.
+//!
+//! ### Using the decoder
+//! ```
+//! use std::fs::File;
+//! // The decoder is a build for reader and can be used to set various decoding options
+//! // via `Transformations`. The default output transformation is `Transformations::IDENTITY`.
+//! let decoder = png::Decoder::new(File::open("tests/pngsuite/basi0g01.png").unwrap());
+//! let mut reader = decoder.read_info().unwrap();
+//! // Allocate the output buffer.
+//! let mut buf = vec![0; reader.output_buffer_size()];
+//! // Read the next frame. An APNG might contain multiple frames.
+//! let info = reader.next_frame(&mut buf).unwrap();
+//! // Grab the bytes of the image.
+//! let bytes = &buf[..info.buffer_size()];
+//! // Inspect more details of the last read frame.
+//! let in_animation = reader.info().frame_control.is_some();
+//! ```
+//!
+//! ## Encoder
+//! ### Using the encoder
+//!
+//! ```no_run
+//! // For reading and opening files
+//! use std::path::Path;
+//! use std::fs::File;
+//! use std::io::BufWriter;
+//!
+//! let path = Path::new(r"/path/to/image.png");
+//! let file = File::create(path).unwrap();
+//! let ref mut w = BufWriter::new(file);
+//!
+//! let mut encoder = png::Encoder::new(w, 2, 1); // Width is 2 pixels and height is 1.
+//! encoder.set_color(png::ColorType::Rgba);
+//! encoder.set_depth(png::BitDepth::Eight);
+//! encoder.set_source_gamma(png::ScaledFloat::from_scaled(45455)); // 1.0 / 2.2, scaled by 100000
+//! encoder.set_source_gamma(png::ScaledFloat::new(1.0 / 2.2));     // 1.0 / 2.2, unscaled, but rounded
+//! let source_chromaticities = png::SourceChromaticities::new(     // Using unscaled instantiation here
+//!     (0.31270, 0.32900),
+//!     (0.64000, 0.33000),
+//!     (0.30000, 0.60000),
+//!     (0.15000, 0.06000)
+//! );
+//! encoder.set_source_chromaticities(source_chromaticities);
+//! let mut writer = encoder.write_header().unwrap();
+//!
+//! let data = [255, 0, 0, 255, 0, 0, 0, 255]; // An array containing a RGBA sequence. First pixel is red and second pixel is black.
+//! writer.write_image_data(&data).unwrap(); // Save
+//! ```
+//!
+
+#![forbid(unsafe_code)]
+
+#[macro_use]
+extern crate bitflags;
+
+pub mod chunk;
+mod common;
+mod decoder;
+mod encoder;
+mod filter;
+mod srgb;
+pub mod text_metadata;
+mod traits;
+mod utils;
+
+pub use crate::common::*;
+pub use crate::decoder::{
+    DecodeOptions, Decoded, Decoder, DecodingError, Limits, OutputInfo, Reader, StreamingDecoder,
+};
+pub use crate::encoder::{Encoder, EncodingError, StreamWriter, Writer};
+pub use crate::filter::{AdaptiveFilterType, FilterType};