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Increase API version to 0.19.8

Merge pull request #102 from oatpp/fix_coroutine_member_caller

Fix coroutine member caller

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Merge pull request #68 from oatpp/full_duplex_mode_support_for_io-eve…

…nt-worker

Full duplex mode support for io event worker

better IO error handling

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Merge pull request #27 from oatpp/virtual_connection

Virtual connection

Cmd line args parser (#21)

* CommandLineArgumetns parser added

* fixed CMakeLists.txt

* Fix to linux build

* Fix linux build for tests