add more requires #34

Job	Run time
macOS / Release / homebrew-clang	8m 41s
macOS / Debug / homebrew-clang	5m 26s
Ubuntu / Release / gcc	24m 18s
Windows / Release / cl	32m 55s
macOS / Release / system-clang	6m 49s
Ubuntu / Debug / gcc	19m 14s
macOS / Debug / system-clang	7m 46s
Windows / Release / clang	29m 1s
Ubuntu / Release / clang	19m 2s
Windows / Release / clang-cl	20m 54s
Ubuntu / Debug / clang	18m 41s
Windows / Debug / cl	27m 49s
Windows / Debug / clang	28m 4s
Windows / Debug / clang-cl	26m 6s
	4h 34m 46s

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