release 3.1.0 : fix deploy repositories HTTP -> HTTPS

Merge pull request #645 from cincheo/dependabot/maven/candy-generator…

…/junit-junit-4.13.1

Bump junit from 4.12 to 4.13.1 in /candy-generator

null safe on useModule

add protection to lambda conversion

fix NPE

2.3.10 release

Optional & enums fixes