Compile Error

[BIT-MJY]

Hello authors,

Thanks for sharing your work!

I have met an error in the compile process:

CMake Error at googletest-download/googletest-download-prefix/tmp/googletest-download-gitclone.cmake:40 (message):
  Failed to checkout tag: 'master'

solved by setting the git tag in gtest/CMakeLists.txt to "main" instead of "master".

This may be caused by the update of google-test, and thus the default git tag in gtest/CMakeLists.txt is suggested to be changed :)