flink版本有支持1.13吗

[zengqinchris]

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[garyli1019]

当前只支持flink 1.11，roadmap中有支持多版本flink

[sjq1992]

多版本的支持是在flink基础api不变的情况下向下兼容的么，即bitsail一个版本能运行在flink 1.11-1.14多个版本上？

[garyli1019]

@sjq1992 计划是这样的，flink接口不兼容的情况加基于不同的版本编译

[garyli1019]

issue created #108