deal with deprecated `scipy.constants` modules #110

Job	Run time
lint-and-typecheck	1m 19s
stubtest-all	59s
stubtest (scipy.cluster)	51s
stubtest (scipy.constants)	42s
stubtest (scipy.datasets)	45s
stubtest (scipy.fft)	51s
stubtest (scipy.fftpack)	51s
stubtest (scipy.integrate)	55s
stubtest (scipy.io)	48s
stubtest (scipy.linalg)	49s
stubtest (scipy.misc)	55s
stubtest (scipy.odr)	51s
stubtest (scipy.optimize)	46s
stubtest (scipy.special)	50s
stubtest (scipy.stats.contingency scipy.stats.distributions)	54s
stubtest (scipy.version)	50s
	13m 56s

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