File vulkan-headers.changes of Package vulkan-headers

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Mon Nov 12 15:08:36 UTC 2018 - Jan Engelhardt <jengelh@inai.de>

- Split vulkan SRPM -> vulkan-headers SRPM, following an upstream
  repository split.
- Update to new upstream release 1.1.91
  * Generally no summary changelog is given for the header files
    by upstream