message: Update README.md
  Bump version from 0.14 to 0.15.
diff: @@ -13,10 +13,10 @@ The library provides a C and C++ interface for all algorithms; you can use it fr
  meshoptimizer is hosted on GitHub; you can download the latest release using git:
  ```
  -git clone -b v0.14 https://github.com/zeux/meshoptimizer.git
  +git clone -b v0.15 https://github.com/zeux/meshoptimizer.git
  ```
  -Alternatively you can [download the .zip archive from GitHub](https://github.com/zeux/meshoptimizer/archive/v0.14.zip).
  +Alternatively you can [download the .zip archive from GitHub](https://github.com/zeux/meshoptimizer/archive/v0.15.zip).
  The library is also available as a package ([ArchLinux](https://aur.archlinux.org/packages/meshoptimizer/), [Vcpkg](https://github.com/microsoft/vcpkg/tree/master/ports/meshoptimizer)).
  