Make migration 0003

[jjmanzer]

Add 3rd migration.

[codecov]

Codecov Report

Merging #11 into master will increase coverage by 0.18%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #11      +/-   ##
==========================================
+ Coverage   94.26%   94.44%   +0.18%     
==========================================
  Files           7        8       +1     
  Lines         122      126       +4     
  Branches        6        6              
==========================================
+ Hits          115      119       +4     
  Misses          7        7

Impacted Files	Coverage Δ
django_snow/migrations/0003_auto_20190607_1500.py	100% <100%> (ø)

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