add rapidjson to requirements #152

Job	Run time
build-conda-packages (x64, windows-2019, 3.7)	50m 47s
build-conda-packages (x64, windows-2019, 3.8)	54m 3s
build-conda-packages (x64, windows-2019, 3.9)	53m 47s
build-conda-packages (x64, windows-2019, 3.10)	58m 52s
build-conda-packages (x64, ubuntu-latest, 3.7)	35m 19s
build-conda-packages (x64, ubuntu-latest, 3.8)	36m 58s
build-conda-packages (x64, ubuntu-latest, 3.9)	36m 46s
build-conda-packages (x64, ubuntu-latest, 3.10)	36m 54s
build-conda-packages (x64, macos-latest, 3.7)	1h 0m 16s
build-conda-packages (x64, macos-latest, 3.8)	51m 16s
build-conda-packages (x64, macos-latest, 3.9)	1h 6m 48s
build-conda-packages (x64, macos-latest, 3.10)	1h 7m 36s
	10h 9m 22s

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