README.md: replace reference to vogl_build/bin/

Due to commit

    bff473a7a1: Move vogl_build/bin to vogl_build

replace references to vogl_build/bin with vogl_build in file README.md

Signed-off-by: Lawrence L Love <lawrencex.l.love@intel.com>
Merge pull request #86 from lawlove/README-update

README.md: replace reference to vogl_build/bin/