Rename parseDate utility to dateToISOString

[tusbar]

This is a more appropriate name.

[codecov]

Codecov Report

Merging #208 into master will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #208   +/-   ##
=======================================
  Coverage   93.73%   93.73%           
=======================================
  Files         193      193           
  Lines        1308     1308           
=======================================
  Hits         1226     1226           
  Misses         82       82           

Impacted Files	Coverage Δ
lib/client/utils.js	100.00% <ø> (ø)
lib/client/models/finances.js	81.48% <100.00%> (ø)
lib/client/models/fulfillment-inbound-shipment.js	91.89% <100.00%> (ø)
lib/client/models/fulfillment-inventory.js	86.36% <100.00%> (ø)
lib/client/models/orders.js	86.11% <100.00%> (ø)
lib/client/models/reports.js	82.97% <100.00%> (ø)

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