add compat to dependencies

[kafisatz]

When using your package, I get an error saying that you should add Compat to your dependencies:

julia> using FastGroupBy
[ Info: Precompiling FastGroupBy [e6aeac8e-85c6-520e-8612-effc59bc0f33]
┌ Warning: Package FastGroupBy does not have Compat in its dependencies:
│ - If you have FastGroupBy checked out for development and have
│   added Compat as a dependency but haven't updated your primary
│   environment's manifest file, try `Pkg.resolve()`.
│ - Otherwise you may need to report an issue with FastGroupBy
└ Loading Compat into FastGroupBy from project dependency, future warnings for FastGroupBy are suppressed.

[xiaodaigh]

can you try ]dev FastGroupBy. I don't' get the same error in the latest dev version on Julia 1.1.1.

[kafisatz]

I am on 1.0.4 for various reasons. And will stay on that version for a while (I think)

[xiaodaigh]

I am on 1.0.4 for various reasons

Is ]dev FastGroupBy an option for you? I might look at get a new release soon

[kafisatz]

Thanks that does actually work for me.

However, I noted that there is some additional functionality which your package does currently not offered (compared to DataFrames.aggregate and DataFrames.groupby) which are:

1. Considering your last example in the Readme: if I have several :grps, say I want to aggregate by [:grps1, :grps2, :grps3] that does not seem possible in this package.
2. if :grps is a custom type which I have defined (for which I have defined isless and thus sort). FastBy does not seem to work. I realize that I may miss some (or all) of the speedup of this package in this case.

Thank you for the support though.

[xiaodaigh]

Done with Compas deps.

As to mulitple groups that was planned but I couldn't get it to run faster than R's data.table. I've tried so many approaches. I will slowly add them. Thanks.