Date/time objects in service responses & entities not immutable

[gomzyakov]

Description

• Date/time objects in service responses & entities not immutable (DateTimeImmutable instead DateTime)

Fixes #21

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 wrote unit tests for my code (if tests is required for my changes)
• I have made changes in CHANGELOG.md file

[codecov-io]

Codecov Report

Merging #25 into master will not change coverage.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##              master       #25   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
  Complexity       588       588           
===========================================
  Files             42        42           
  Lines           1338      1338           
===========================================
  Hits            1338      1338           

Flag	Coverage Δ	Complexity Δ
#php	100.00% <100.00%> (ø)	588.00 <41.00> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ	Complexity Δ
src/DateTimeFactory.php	100.00% <100.00%> (ø)	4.00 <1.00> (ø)
src/Responses/DevTokenResponse.php	100.00% <100.00%> (ø)	15.00 <1.00> (ø)
src/Responses/Entities/Balance.php	100.00% <100.00%> (ø)	15.00 <4.00> (ø)
src/Responses/Entities/Domain.php	100.00% <100.00%> (ø)	23.00 <4.00> (ø)
src/Responses/Entities/Group.php	100.00% <100.00%> (ø)	23.00 <4.00> (ø)
src/Responses/Entities/Report.php	100.00% <100.00%> (ø)	33.00 <4.00> (ø)
src/Responses/Entities/ReportMade.php	100.00% <100.00%> (ø)	8.00 <3.00> (ø)
src/Responses/Entities/ReportType.php	100.00% <100.00%> (ø)	39.00 <4.00> (ø)
src/Responses/Entities/User.php	100.00% <100.00%> (ø)	31.00 <4.00> (ø)
src/Responses/UserBalanceResponse.php	100.00% <100.00%> (ø)	13.00 <2.00> (ø)
... and 6 more

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[tarampampam]

👍 Great thanks for your contribution!