#137 - Add support of false return type

[Jeckerson]

Hello!

• Type: new feature

In raising this pull request, I confirm the following:

• I have read and understood the Contributing Guidelines
• I have checked that another pull request for this purpose does not exist.
• I wrote some tests for this PR.

Thanks

[codecov]

Codecov Report

Merging #138 (c0f2a15) into development (e3be900) will increase coverage by 0.21%.
The diff coverage is 75.00%.

@@               Coverage Diff               @@
##           development     #138      +/-   ##
===============================================
+ Coverage        78.63%   78.84%   +0.21%     
===============================================
  Files                5        5              
  Lines             5101     5087      -14     
===============================================
  Hits              4011     4011              
+ Misses            1090     1076      -14     

Flag	Coverage Δ
Linux	76.71% <75.00%> (+0.39%)	⬆️
macOS	87.53% <100.00%> (+0.09%)	⬆️
unittests	78.84% <75.00%> (+0.21%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
parser/zephir.lemon	49.26% <60.00%> (+0.82%)	⬆️
parser/parser.h	89.36% <100.00%> (+0.37%)	⬆️
parser/scanner.re	85.66% <0.00%> (+0.03%)	⬆️

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