Readiness callback and readme improvements#675

Merged

alaneuler merged 5 commits intosofastack:masterfrom

alaneuler:feat/break.readiness

Jul 23, 2020

Commits on Jul 23, 2020

break readiness callback invoking when there failure happening
纶珥
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update version to 3.4.2-SNAPSHOT
纶珥
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remove 3.0 in readme
纶珥
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add more readiness check information
纶珥
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fix readiness tests
纶珥
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