Next major release

[Baptouuuu]

This work is in preparation for the testing framework.

This PR will stay in this state until the whole innmind/foundation new API is stable enough to build innmind/testing.

[codecov]

Codecov Report

❌ Patch coverage is 86.44068% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 94.17%. Comparing base (9f0cb69) to head (3110057).
⚠️ Report is 10 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/Content/Multipart/Data.php	0.00%	1 Missing ⚠️
src/Content/Multipart/File.php	0.00%	1 Missing ⚠️
src/Header/Date.php	50.00%	1 Missing ⚠️
src/Header/Expires.php	50.00%	1 Missing ⚠️
src/Header/IfModifiedSince.php	50.00%	1 Missing ⚠️
src/Header/IfUnmodifiedSince.php	50.00%	1 Missing ⚠️
src/Header/LastModified.php	50.00%	1 Missing ⚠️
src/Header/SetCookie/Expires.php	50.00%	1 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             develop      #20      +/-   ##
=============================================
- Coverage      96.14%   94.17%   -1.97%     
  Complexity      1096     1096              
=============================================
  Files            197      197              
  Lines           4721     4328     -393     
=============================================
- Hits            4539     4076     -463     
- Misses           182      252      +70     

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