Consider prerelease versions if version field of a dependency is unspecified (issue#600) #6341

Job	Run time
build test linux x86-64	3m 55s
build test windows x86-64	21m 19s
check-rust	4m 10s
doc tests	3m 15s
check-website	9s
scarb-metadata compatibility check	49s
test linux x86-64 1/8	19s
test linux x86-64 2/8	13s
test linux x86-64 3/8	9m 56s
test linux x86-64 4/8	9m 34s
test linux x86-64 5/8	6m 56s
test linux x86-64 6/8	10m 21s
test linux x86-64 7/8	9m 0s
test linux x86-64 8/8	6m 46s
test windows x86-64 1/8	47s
test windows x86-64 2/8	53s
test windows x86-64 3/8	10m 31s
test windows x86-64 4/8	8m 20s
test windows x86-64 5/8	7m 35s
test windows x86-64 6/8	9m 30s
test windows x86-64 7/8	8m 6s
test windows x86-64 8/8	6m 56s
	2h 19m 20s

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