Add Dir::{read_link_contents,symlink_contents} methods (#356) #1663

Job	Run time
Check Cross-Compilation on Rust nightly on Windows (nightly)	1m 33s
Check Cross-Compilation on Rust nightly (nightly)	1m 56s
Check Cross-Compilation on Windows (stable)	2m 45s
Check Cross-Compilation (stable)	1m 35s
Fuzz Targets	46s
Check Cross-Compilation on Windows (beta)	1m 33s
Check Cross-Compilation (beta)	1m 25s
Rustfmt	6s
Test linux-raw support (ubuntu)	32s
Test (stable)	26s
Test linux-raw support (ubuntu-20.04)	28s
Test (msrv)	2m 29s
Test (windows-latest)	2m 45s
Test on Musl (ubuntu)	49s
Test (windows-2019)	1m 51s
Test (macos-latest)	43s
Test with Rust nightly (ubuntu)	33s
Test with Rust nightly (windows)	1m 31s
Test (macos-11)	1m 9s
Test (beta)	29s
Test (ubuntu-20.04)	29s
Test (aarch64-ubuntu)	2m 32s
	28m 25s

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