Fix bad return of hashes

[bhearsum]

I might be missing something, but I'm not sure how the code is supposed to work in its current form - when I use debug logging, data quite clearly does not contain hashes, and the block above this pretty clear is meant to built up the hashes that the caller wants.

[codecov[bot]]

Codecov Report

Merging #392 into master will not change coverage. The diff coverage is 0.00%.

@@           Coverage Diff           @@
##           master     #392   +/-   ##
=======================================
  Coverage   94.20%   94.20%           
=======================================
  Files          11       11           
  Lines        1157     1157           
=======================================
  Hits         1090     1090           
  Misses         67       67           

Impacted Files	Coverage Δ
pyup/requirements.py	88.46% <0.00%> (ø)

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[cblegare]

If you can do that, it would be great to avoid regressions.

Avoiding regression is great, but in the meantime, the tool is broken. Please consider merging this as-is