Canary

Canary is used at run time in 4 crates.

Number of dependers	Canary version	Downloads/month
2	0.3.3	7
1	0.1.6	0
1	0.0.6	2

Depender (with downloads and own rev deps)			Canary version
		saildb		^0.0.6
	1	srpc		^0.1.6
	1	maquio		^0.3.1
		june		^0.3.2