[Dev Deps] update `markdown-link-check` #280

Job	Run time
tests (install_script, bash)	56s
tests (sourcing, sh)	45s
tests (sourcing, bash)	48s
tests (sourcing, dash)	43s
tests (sourcing, zsh)	1m 54s
tests (slow, sh)	3m 13s
tests (slow, bash)	3m 14s
tests (slow, dash)	3m 18s
tests (slow, zsh)	3m 43s
tests (installation_iojs, sh)	1m 4s
tests (installation_iojs, bash)	1m 3s
tests (installation_iojs, dash)	1m 1s
tests (installation_iojs, zsh)	1m 30s
all test suites, all shells	1s
	23m 13s

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