enforce strict typing

[mmoll]

Type of PR

• [ ] Bugfix
• [ ] New Feature
• [x] Other (explain):

Breaking changes

• [ ] Yes, this is a breaking change

Description

As we have 100% test coverage, this should be safe.

[codecov[bot]]

Codecov Report

Merging #127 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             master   #127   +/-   ##
=======================================
  Coverage       100%   100%           
  Complexity      133    133           
=======================================
  Files             6      6           
  Lines           556    556           
=======================================
  Hits            556    556

Impacted Files	Coverage Δ	Complexity Δ
...iffs/Formatting/AlphabeticalUseStatementsSniff.php	100% <ø> (ø)	35 <0> (ø)	:arrow_down:
...iffs/Strings/VariableInDoubleQuotedStringSniff.php	100% <ø> (ø)	15 <0> (ø)	:arrow_down:
...4/Sniffs/Arrays/ArrayDoubleArrowAlignmentSniff.php	100% <ø> (ø)	26 <0> (ø)	:arrow_down:
MO4/Sniffs/Commenting/PropertyCommentSniff.php	100% <ø> (ø)	22 <0> (ø)	:arrow_down:
MO4/Sniffs/Arrays/MultiLineArraySniff.php	100% <ø> (ø)	8 <0> (ø)	:arrow_down:
...iffs/Formatting/UnnecessaryNamespaceUsageSniff.php	100% <ø> (ø)	27 <0> (ø)	:arrow_down:

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