Ruby: handle curly bracket

[masatake]

Class.new {
  def f2() end
}

With this change, ctags extracts f2.

[codecov]

Codecov Report

Base: 82.82% // Head: 82.82% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (ac7ef35) compared to base (c39ff7a).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3633   +/-   ##
=======================================
  Coverage   82.82%   82.82%           
=======================================
  Files         223      223           
  Lines       54492    54501    +9     
=======================================
+ Hits        45133    45142    +9     
  Misses       9359     9359           

Impacted Files	Coverage Δ
parsers/ruby.c	98.51% <100.00%> (+0.02%)	⬆️
parsers/perl.c	90.90% <0.00%> (ø)
optlib/kconfig.c	0.00% <0.00%> (ø)

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