add3

add3 is used at run time in 3 crates.

Number of dependers	add3 version	Downloads/month
1	4.0.0	6
1	3.1.0	4
1	1.0.0	4

Depender			add3 version
		add6		^1.0.0
		add6_64		^3.0.0
		add6_64b		^4.0.0