seems official repo is now able to be compiled & linked directly by hunter

• I've followed this guide
  step by step carefully. [Yes|No]

• My change will resolve this "New package" request: https://github.com/cpp-pm/hunter/issues/

• I've followed this guide
  step by step carefully. [Yes|No]

• This update will break a few toolchains.
  • Toolchain 1
  • Toolchain 2

• This update will fix a few toolchains.
  • Toolchain 1
  • Toolchain 2

• I've checked this Git style guide. [Yes|No]
• I've checked this CMake style guide. [Yes|No]
• My change will work with CMake 3.10 (minimum requirement for Hunter). [Yes|No]
• I will try to keep this pull request as small as possible and will try not to mix unrelated features. [Yes|No]