BelongsToCreateAssociationMixin Return Type Void in NPM

[ekristen]

I'm trying to find the discrepancy but it seems the latest published in NPM has a version that's not matching master and since this repository doesn't have any tags/releases it's hard to understand what code version is suppose to be where.

It seems that the current version published the return type for BelongsToCreateAssociationMixin is void, when it really should be an instance, and it seems like the master branch has this set properly.