Jin Hai a876ae1b64
Change C++ standard to c++17 (#911)
* [skip ci]#668 - Update badge of README

* Fix README.md

* Fix README.md

* Merge remote-tracking branch 'upstream/master'

* #910 Change c++ standard to c++17

* Remove unused headers
2020-01-04 18:48:22 +08:00
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2020-01-04 18:48:22 +08:00