Move tests/bootstrap.php to autoload-dev section in composer.json

[vjik]

Q	A
Is bugfix?	✔️
New feature?	❌
Breaks BC?	❌

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.88%. Comparing base (f17f4a2) to head (881c4b1).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #392   +/-   ##
=========================================
  Coverage     99.88%   99.88%           
  Complexity      275      275           
=========================================
  Files            32       32           
  Lines           845      845           
=========================================
  Hits            844      844           
  Misses            1        1           

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