py-boost runtime should be = not >=

[bp-kelley]

conda-rdkit/rdkit/meta.yaml

Line 37 in 92017d1

- py-boost >=1.65.1

This pulls the wrong rdkit version at runtime if a new one exists.

[bp-kelley]

Should be

 - py-boost ==1.65.1

[rvianello]

I think this was addressed on the development branch, although the full resolution might be to be confirmed, and the corresponding issue (#71) is still open.