mozjs

mozjs is used at run time in 3 crates.

Number of dependers	mozjs version	Downloads/month
0	0.15.0	9.3K
0	0.14.8	14K
2	0.10.1	0
1	0.2.0	0

Depender			mozjs version
		es_runtime		^0.10.1
		sp-wasm-engine		^0.10
		josephine		<0.3