phpstan: set max inspection level, fixes #56

[xalopp]

No description provided.

[codecov]

Codecov Report

Merging #58 into master will increase coverage by 0.08%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master      #58      +/-   ##
============================================
+ Coverage     96.08%   96.17%   +0.08%     
- Complexity      122      125       +3     
============================================
  Files             6        6              
  Lines           639      549      -90     
============================================
- Hits            614      528      -86     
+ Misses           25       21       -4

Impacted Files	Coverage Δ	Complexity Δ
...iffs/Formatting/AlphabeticalUseStatementsSniff.php	89.92% <100%> (+0.56%)	37 <0> (+2)	⬆️
...iffs/Formatting/UnnecessaryNamespaceUsageSniff.php	100% <100%> (ø)	26 <0> (+1)	⬆️
MO4/Sniffs/Commenting/PropertyCommentSniff.php	91.83% <100%> (+0.1%)	22 <0> (ø)	⬇️
MO4/Sniffs/Arrays/MultiLineArraySniff.php	100% <0%> (ø)	8% <0%> (ø)	⬇️
...iffs/Strings/VariableInDoubleQuotedStringSniff.php	100% <0%> (ø)	15% <0%> (ø)	⬇️
...4/Sniffs/Arrays/ArrayDoubleArrowAlignmentSniff.php	100% <0%> (ø)	17% <0%> (ø)	⬇️

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[mmoll]

merged, merci @xalopp!