fix counting non-countable (fix #87)

[sualko]

PHP 7.2 new Warning: Warn when counting non-countable types

[codecov]

Codecov Report

Merging #88 into master will decrease coverage by 0.1%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master      #88      +/-   ##
============================================
- Coverage     81.15%   81.04%   -0.11%     
  Complexity      275      275              
============================================
  Files            29       29              
  Lines           939      939              
============================================
- Hits            762      761       -1     
- Misses          177      178       +1

Impacted Files	Coverage Δ	Complexity Δ
lib/newcontentcontainer.php	100% <ø> (ø)	3 <0> (ø)	⬇️
lib/Controller/HttpBindController.php	98.61% <100%> (-1.39%)	26 <0> (ø)

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[LEDfan]

Thanks @sualko for taking care, I fixed the logic for checking the types.

I also updated php-cs-fixer to a version which supports PHP 7.2 and run it.

[LEDfan]

@sualko I guess changing the composer.json to use version *.* of phpunit will do the trick to install the correct phpunit version for the PHP version.

[LEDfan]

Already merged inside #86