Use a more recent version of DataFrames

[eperim]

DataFrames has now released their v1.0, but this repo still locks its dependency to some prior versions, which can lead to compat issues with other packages. It would be great to relax that dependency.

[DoaneAS]

Hi,

It looks like the DataFrames package in currently supported Julia (>=1.6) made some changes to syntax for constructing a 'DataFrame' from a 'Matrix'. A work around is to use DataFrames v0.2, however v0.2 causes many other issues with standard Julia packages (it breaks JLD2 for example).

I have little experience with Julia and would be great if this repo was maintained.

thanks

Following up on this: compatible version can be installed using:
(@v1.7) pkg> add LowRankModels#e15afec