y4m 0.6.1

# rustc version
rustc 1.47.0-nightly (bbebe7351 2020-07-22)# docs.rs version
docsrs 0.6.0 (c9e59af 2020-07-19)# build log
[INFO] running `Command { std: "docker" "create" "-v" "/home/cratesfyi/workspace/builds/y4m-0.6.1/target:/opt/rustwide/target:rw,Z" "-v" "/home/cratesfyi/workspace/builds/y4m-0.6.1/source:/opt/rustwide/workdir:ro,Z" "-v" "/home/cratesfyi/workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/home/cratesfyi/workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1001" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "RUSTFLAGS=" "-e" "RUSTDOCFLAGS=-Z unstable-options --resource-suffix -20200722-1.47.0-nightly-bbebe7351 --static-root-path / --cap-lints warn --extern-html-root-url resize=https://docs.rs/resize/0.4.0" "-e" "DOCS_RS=1" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "3221225472" "--cpus" "2" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+nightly" "doc" "--lib" "--no-deps" "-j2", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 7c6e04c8660e1c0877734d3a60c8756bbe8d373b28520735595d2d59840a6cf7
[INFO] running `Command { std: "docker" "start" "-a" "7c6e04c8660e1c0877734d3a60c8756bbe8d373b28520735595d2d59840a6cf7", kill_on_drop: false }`
[INFO] [stderr]  Documenting y4m v0.6.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.17s
[INFO] running `Command { std: "docker" "inspect" "7c6e04c8660e1c0877734d3a60c8756bbe8d373b28520735595d2d59840a6cf7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7c6e04c8660e1c0877734d3a60c8756bbe8d373b28520735595d2d59840a6cf7", kill_on_drop: false }`
[INFO] [stdout] 7c6e04c8660e1c0877734d3a60c8756bbe8d373b28520735595d2d59840a6cf7