ENH: update package version to 0.15.0

[conda-forge-admin]

Hi! This is the friendly automated conda-forge-webservice.

I've started a version update as instructed in #28.

I'm currently searching for new versions and will update this PR shortly if I find one! Thank you for waiting!

Fixes #28

[conda-forge-admin]

Hi! This is the friendly automated conda-forge-linting service.

I just wanted to let you know that I linted all conda-recipes in your PR (recipe/recipe.yaml) and found it was in an excellent condition.

[kkraus14]

Waiting on NVIDIA/numba-cuda#293 (comment) to determine if we need to add cuda-nvcc here as well or not.

[kkraus14]

@gmarkall I know that we have all of the shared libraries covered based on these but I'm not clear on what headers we'd look for at runtime. Given the current state doesn't enforce any specific dependencies, we aren't making things worse, but it would be nice to capture whatever headers we need as dependencies as well.

[gmarkall]

For "normal usage" we don't have extra requirements:

• The headers we need are vendored (cuda_fp16.h / hpp, cuda_bf16.h / hpp).
• We require cuda/atomic for when NRT is enabled (it is experimental, and disabled by default).
• Others we require / expect only for the test suite are:
  • cooperative_groups.h
  • cuda_device_runtime_api.h
  • curand_kernel.h