Fix: Bring back support for PHP 7.1

[localheinz]

This PR

• brings back support for PHP 7.1

Related to ergebnis/composer-normalize#266.

[codecov]

Codecov Report

Merging #166 into master will decrease coverage by 6.44%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #166      +/-   ##
============================================
- Coverage     90.63%   84.18%   -6.45%     
  Complexity      135      135              
============================================
  Files            22       22              
  Lines           395      449      +54     
============================================
+ Hits            358      378      +20     
- Misses           37       71      +34

Impacted Files	Coverage Δ	Complexity Δ
...c/Closures/NoNullableReturnTypeDeclarationRule.php	63.63% <0%> (-14.15%)	4% <0%> (ø)
src/Expressions/NoCompactRule.php	61.53% <0%> (-11.19%)	5% <0%> (ø)
.../Functions/NoNullableReturnTypeDeclarationRule.php	69.23% <0%> (-10.77%)	5% <0%> (ø)
src/Files/DeclareStrictTypesRule.php	78.94% <0%> (-9.29%)	9% <0%> (ø)
...res/NoParameterWithNullableTypeDeclarationRule.php	80% <0%> (-8.24%)	5% <0%> (ø)
...c/Closures/NoParameterWithNullDefaultValueRule.php	81.81% <0%> (-7.66%)	6% <0%> (ø)
...ons/NoParameterWithNullableTypeDeclarationRule.php	81.81% <0%> (-7.66%)	5% <0%> (ø)
...rc/Methods/NoNullableReturnTypeDeclarationRule.php	80% <0%> (-7.5%)	5% <0%> (ø)
.../Functions/NoParameterWithNullDefaultValueRule.php	83.33% <0%> (-7.15%)	6% <0%> (ø)
src/Methods/PrivateInFinalClassRule.php	84% <0%> (-6.91%)	9% <0%> (ø)
... and 7 more

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