add dependency on clvm-traits #1565

Job	Run time
Wheel on macos-latest py-3.7	3m 39s
Checks	38s
Wheel on ubuntu-latest py-3.7	2m 24s
Wheel on windows-latest py-3.7	3m 8s
coverage	4m 28s
Run fuzz targets (macos-latest, 3.7)	31m 26s
Run fuzz targets (ubuntu-latest, 3.7)	19m 56s
Unit tests (macos-latest, 3.7)	8m 36s
Unit tests (ubuntu-latest, 3.7)	3m 8s
Unit tests (windows-latest, 3.7)	7m 4s
Upload to PyPI	24s
	1h 24m 51s

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