Require boost < 1.69 for CUDA-enabled tests
Created by: aprokop
Related to #168
Note that benchmarks work with any Boost (at least, Boost >= 1.67.0). Tested with 1.70.0.
Created by: aprokop
Related to #168
Note that benchmarks work with any Boost (at least, Boost >= 1.67.0). Tested with 1.70.0.