update version number to 8.1

6 jobs for master in 9 minutes and 6 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
passed #11379
macos
build_macos

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ubuntu1604
build_ubuntu1604

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ubuntu1804
build_ubuntu1804

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ubuntu1804-gcc8
build_ubuntu1804-gcc8

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vc191x
build_vc191x

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vc192x
build_vc192x

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