Laravel 8.x is supported now

[tarampampam]

Description

Changed

• Laravel 8.x is supported now
• Minimal Laravel version now is 6.0 (Laravel 5.5 LTS got last security update August 30th, 2020)

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 #8 into master will increase coverage by 0.23%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master       #8      +/-   ##
============================================
+ Coverage     91.42%   91.66%   +0.23%     
  Complexity       24       24              
============================================
  Files             3        3              
  Lines           105      108       +3     
  Branches          9        9              
============================================
+ Hits             96       99       +3     
  Misses            5        5              
  Partials          4        4              

Flag	Coverage Δ	Complexity Δ
#js	80.48% <ø> (ø)	0.00 <ø> (ø)
#php	98.50% <ø> (+0.06%)	24.00 <ø> (ø)

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Impacted Files	Coverage Δ	Complexity Δ
src/Back2FrontStack.php	100.00% <0.00%> (ø)	13.00% <0.00%> (ø%)
src/ServiceProvider.php	97.36% <0.00%> (+0.14%)	11.00% <0.00%> (ø%)

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