Change recommended Imath version to 3.1.12.#2120

doug-walker merged 2 commits into

AcademySoftwareFoundation:mainAcademySoftwareFoundation/OpenColorIO:mainfrom

mjtitchener-fn:mt/update_imath_versionmjtitchener-fn/OpenColorIO:mt/update_imath_versionCopy head branch name to clipboard