Laravel 8.x is supported now

[tarampampam]

Description

Changed

• Laravel 8 is supported
• Minimal Laravel version now is 6.0 (Laravel 5.5 LTS got last security update August 30th, 2020)
• Guzzle 7 (guzzlehttp/guzzle) is supported
• Dependency tarampampam/wrappers-php version ~2.0 is supported

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made changes in CHANGELOG.md file

[codecov-commenter]

Codecov Report

Merging #12 into master will not change coverage.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##              master       #12   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
  Complexity       123       123           
===========================================
  Files             23        23           
  Lines            378       378           
===========================================
  Hits             378       378           

Flag	Coverage Δ	Complexity Δ
#php	100.00% <100.00%> (ø)	123.00 <2.00> (ø)

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Impacted Files	Coverage Δ	Complexity Δ
src/Exceptions/CloudPaymentsRequestException.php	100.00% <100.00%> (ø)	2.00 <2.00> (ø)

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