Add rjust to force 4 digit crc-16

[everestcw]

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We've noticed that in some cases when the Hex value of the CRC-16 starts with a 0 the conversion to string removes the zeros on the start. With this, we fix this problem. I've also added a taste to simulate that scenario.

[mergeable[bot]]

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[pedrofurtado]

Fala Caio, @everestcw , tudo joia? 👋

Obrigado pela contribuição 🎉

[codecov-commenter]

Codecov Report

Merging #27 (45ef3ce) into master (143c21c) will not change coverage. The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master       #27   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            4         4           
  Lines          209       215    +6     
=========================================
+ Hits           209       215    +6     

Impacted Files	Coverage Δ
lib/qrcode_pix_ruby/payload.rb	100.00% <100.00%> (ø)
spec/qrcode_pix_ruby_spec.rb	100.00% <100.00%> (ø)

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[everestcw]

@everestcw Caio, poderia por gentileza atualizar sua branch com a master e gerar uma entrada em CHANGELOG.md? Apos isso, acredito que o CI fique ok ✅

Fala, Pedro. Fiz os ajustes que você pediu. 👍

[pedrofurtado]

@everestcw o CI falhou, provável q a alteração tenha quebrado algo no comportamento. Vale dar uma zoiadinha belê, rodar a suíte localmente qq coisa 🤝