fix for excluding last column in unpivot macro

[alexcampana]

Excluding the last column of a table in the unpivot macro would add an additional union all to the end.

[drewbanin]

Thanks @alexcampana - you can ignore the Circle failure -- i think that's unrelated to your PR.

Please also ignore both my original comment, and me closing this PR by accident -- it has been a long day :)

This looks good to me! Let me see if I can fix the circle issues separately. If I can't do that in a timely manner, then I'm cool with just merging this.

[drewbanin]

@alexcampana just got tests passing over here: #82

I'm waiting on a PR. Once that's merged, if you can pull in master, then your tests will pass and we can merge this! I can update you here when it's merged

[drewbanin]

@alexcampana thanks for your patience! I think if you merge master, these tests should now pass!

[alexcampana]

@drewbanin no problem, looks like the tests are passing now!

[drewbanin]

@alexcampana I just released 0.1.16. Thanks for the fix!