Run tests with error_reporting=E_ALL

[Slamdunk]

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[codecov]

Codecov Report

Merging #530 (f252d54) into master (1eee4d7) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master     #530   +/-   ##
=========================================
  Coverage     95.33%   95.33%           
  Complexity      356      356           
=========================================
  Files            45       45           
  Lines           857      857           
=========================================
  Hits            817      817           
  Misses           40       40           

Impacted Files	Coverage Δ
src/Connection.php	87.50% <100.00%> (ø)
src/Mailbox.php	96.96% <100.00%> (ø)
src/Message/AbstractPart.php	95.89% <100.00%> (ø)

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