disable test for GET /stats/month

[hbagdi]

API always times out when accessing the endpoint; should reactivate once unsplash fixes it

[codecov]

Codecov Report

Merging #38 into master will decrease coverage by 3.69%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master      #38     +/-   ##
=========================================
- Coverage   83.53%   79.84%   -3.7%     
=========================================
  Files          17       17             
  Lines         893      893             
=========================================
- Hits          746      713     -33     
- Misses         99      136     +37     
+ Partials       48       44      -4

Impacted Files	Coverage Δ
unsplash/stats.go	53.33% <0%> (-19.26%)	⬇️
unsplash/unsplash.go	72.52% <0%> (-7.7%)	⬇️

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