Commits
Nikita Titov authored and Guolin Ke committed 691b842832f
[ci] update CI stuff (#2079) * updated boost submodule * updated docker with new stable Clang and CMake * switch to dev docker * updated setup script * updated MinGW on Appveyor * updated Azure config to use docker for GPU task * do not upgrade gcc - takes too long * test: switch compilers * switch compilers back * get back to main docker