y4m 0.7.0

# rustc version
rustc 1.47.0-nightly (e15510ca3 2020-08-20)
# docs.rs version
docsrs 0.6.0 (2acd7ee 2020-08-20)

# build log
[INFO] running `Command { std: "docker" "create" "-v" "/home/cratesfyi/workspace/builds/y4m-0.7.0/target:/opt/rustwide/target:rw,Z" "-v" "/home/cratesfyi/workspace/builds/y4m-0.7.0/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" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "RUSTFLAGS=" "-e" "RUSTDOCFLAGS=-Z unstable-options --static-root-path / --cap-lints warn --extern-html-root-url resize=https://docs.rs/resize/0.4.3 --resource-suffix -20200820-1.47.0-nightly-e15510ca3" "-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" "--user" "1001:1001" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+nightly" "doc" "--lib" "--no-deps" "-j2", kill_on_drop: false }`
[INFO] [stdout] 865ec41c21e414de896611f737d65f226150bc8d0e7bf43249c2181429d677ed
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "865ec41c21e414de896611f737d65f226150bc8d0e7bf43249c2181429d677ed", kill_on_drop: false }`
[INFO] [stderr] /opt/crates-build-env/entrypoint.sh: line 7: /etc/hosts: Permission denied
[INFO] [stderr]  Documenting y4m v0.7.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.24s
[INFO] running `Command { std: "docker" "inspect" "865ec41c21e414de896611f737d65f226150bc8d0e7bf43249c2181429d677ed", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "865ec41c21e414de896611f737d65f226150bc8d0e7bf43249c2181429d677ed", kill_on_drop: false }`
[INFO] [stdout] 865ec41c21e414de896611f737d65f226150bc8d0e7bf43249c2181429d677ed