make count dataframe float > int

[rhannema]

Hi.

[codecov]

Codecov Report

Merging #127 into master will increase coverage by 0.13%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #127      +/-   ##
==========================================
+ Coverage   90.36%   90.49%   +0.13%     
==========================================
  Files          32       32              
  Lines        1993     1989       -4     
==========================================
- Hits         1801     1800       -1     
+ Misses        192      189       -3

Impacted Files	Coverage Δ
abagen/allen.py	98.07% <100%> (ø)	⬆️
abagen/datasets/fetchers.py	93.05% <0%> (+3.58%)	⬆️

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[rmarkello]

Woohoo, looks like this change worked! Thanks so much for the PR @rhannema. I'm going to go ahead and merge it in, now 😁