#166 - Add support for single letter classes

[Jeckerson]

Hello!

• Type: bug fix | new feature | code quality | documentation
• Link to issue:

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.

Small description of change:

Thanks

[codecov]

Codecov Report

❌ Patch coverage is 28.57143% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 76.69%. Comparing base (1383bd6) to head (a20afd3).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
parser/zephir.lemon	28.57%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #167      +/-   ##
==========================================
- Coverage   76.72%   76.69%   -0.03%     
==========================================
  Files           5        5              
  Lines        3029     3030       +1     
  Branches      128      128              
==========================================
  Hits         2324     2324              
- Misses        705      706       +1     

Flag	Coverage Δ
Linux	76.69% <28.57%> (-0.03%)	⬇️
unittests	76.69% <28.57%> (-0.03%)	⬇️

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