Mendeleev

Mendeleev is used at run time in 6 crates. It is a direct run-time dependency in 2 crates.

Number of dependers	Mendeleev version	Downloads/month
3	0.8.0	45
3	0.7.0	13

Depender (with downloads and own rev deps)			Mendeleev version
	1	minitpr		^0.8.0
	2	chem-eq		^0.7.0