Minimum change to support gradle build using Java 8#43

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rock-yu wants to merge 2 commits intoVaughnVernon:masterfrom

Commits on May 17, 2021

do a minimum gradle version upgrade so now at lease Vaughn demo will build with JDK8
rock-yu
committed

Commits on Oct 25, 2021

Update readme - change Java version requirement to 8
rock-yu
authored