mm2

mm2 is used at run time in 3 crates.

Number of dependers	mm2 version	Downloads/month
0	0.16.0	120
1	0.15.1	200
2	0.13.6	360
0	0.13.3	600

Depender (with downloads and own rev deps)			mm2 version
1.1K	2	asts		^0.15.1
390		csbq		^0.13
		polyNext		^0.13