[t-28PUq4RM] Limit maxInstalments to 6 for Uruguay

[jvmoreira]

This Pull Request limits the number of instalments from 12 to 6 for Uruguay.

[codecov-commenter]

Codecov Report

Merging #178 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #178   +/-   ##
=======================================
  Coverage   98.21%   98.21%           
=======================================
  Files          58       58           
  Lines        1067     1067           
=======================================
  Hits         1048     1048           
  Misses         19       19           

Impacted Files	Coverage Δ
src/Services/Gateways/CreditCard.php	100.00% <ø> (ø)

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