Merge pull request #17 from davxy/v0.6.6-rc0 #7

Job	Run time
validate (codec)	24s
validate (traces)	30s
validate (stf/accumulate)	25s
validate (stf/statistics)	26s
validate (stf/authorizations)	27s
validate (stf/safrole)	31s
validate (stf/preimages)	30s
validate (stf/assurances)	26s
validate (stf/disputes)	33s
validate (stf/history)	26s
validate (stf/reports)	30s
	5m 8s

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