Valid use of private generates offense

[craiglittle]

Expected behavior

Uses of private within a class defined using Class.new should not generate a Useless private access modifier. offense.

Actual behavior

A Useless private access modifier. offense is generated.

Steps to reproduce the problem

When I run v0.40.0 against the master branch of the biz gem, I get the following output:

Running RuboCop...
Inspecting 80 files
.......W........................................................................

Offenses:

lib/biz/calculation/for_duration.rb:66:15: W: Useless private access modifier.
              private
              ^^^^^^^
lib/biz/calculation/for_duration.rb:95:15: W: Useless private access modifier.
              private
              ^^^^^^^

Here's the section of the code causing the erroneous offenses.

RuboCop version

>> rubocop -V
0.40.0 (using Parser 2.3.1.0, running on ruby 2.3.0 x86_64-darwin15)

Hope that's helpful! Let me know if I can provide any other details.