Remove front underscore from variable.other.constant.ruby scope

[graceful-potato]

Ruby constant should begins with an uppercase letter.
_variable_name is not a constant

[noniq]

Good catch. Support for leading underscores was added in 6628e6c without further explanation. The correct regexp should have been '\b_?[A-Z]\w*\b' though, to not match variables starting with an underscore.

However, Ruby obviously does not support constants starting with an underscore:

_FOO = 1
self.class.const_defined?(:_FOO)
# ~> -:2:in `const_defined?': wrong constant name _FOO (NameError)
# ~> 	from -:2:in `<main>'

So this fix totally makes sense. Thanks!