Alembic 1.8.3 has been released

[Lucas Miller]

Thanks to your feedback and submitted issues we have a few bug fixes.

Make sure we export the IlmBase requirement in CMake when using OpenEXR 2 to
fulfill the Imath requirement. (Issue 355)

Address report from GCC Undefined Behavior Sanitizer by initializing a couple
of bools in OXform. (Issue 357)

Fix compile issue when using C++17 with Microsoft Visual Studio and use a
hopefully much faster find first bit set when using that compiler. (Issue 358)

It can be gotten here:

https://github.com/alembic/alembic/releases/tag/1.8.3

Lucas