OK to do case-insensitive checks on the OrderedGems cop?

[breckenedge]

I love the new OrderedGems cop, it's a fantastic idea!

However, the OrderedGems cop uses the < sign to perform its comparison, and I have one pesky dependency that starts with a capital letter (the wonderful-yet-inconsistently-named StreetAddress gem). Since 'a' < 'Z' #=> false, it wants to sort this dependency at the top of my Gemfile. Would it be acceptable to write a PR that performs a case-insensitive comparison?

---

Expected behavior

The OrderedGems cop doesn't consider case when checking the Gemfile.

Actual behavior

The OrderedGems cop considers case when checking the Gemfile.

Steps to reproduce the problem

# in Gemfile
source 'https://rubygems.org'
gem 'sinatra'
gem 'StreetAddress'

rubocop
Inspecting 1 file
C

Offenses:

Gemfile:4:1: C: Gem StreetAddress should appear before sinatra in their gem group.
gem 'StreetAddress'
^^^^^^^^^^^^^^^^^^^

1 file inspected, 1 offense detected

RuboCop version

$ rubocop -V
0.46.0 (using Parser 2.3.3.1, running on ruby 2.3.1 x86_64-darwin16)

[bbatsov]

Make sense to me. Although I'd also suggest to the gem author to rename this, so it would match common conventions.