EnvironmentComparison does not recognize other equality comparisons

[matthewhively]

I would have assumed that the ordering of a comparison would be irrelevant to rubocop. Apparently this is wrong in at least this case.
In addition, I would assume that negative comparisons would also be caught.

---

Expected behavior

Rails.env == 'development'
Rails.env != 'development'
'development' == Rails.env
'development' != Rails.env
Should all be detected by this Cop

Actual behavior

Only Rails.env == 'development' is recognized by this Cop.

Steps to reproduce the problem

Testfile.rb

# All Bad examples
  
# Recognized
if Rails.env == 'development'
  puts 'test1'
end

if Rails.env != 'development'
  puts 'test2'
end

if 'development' == Rails.env
  puts 'test3'
end

if 'development' != Rails.env
  puts 'test4'
end

puts 'test5'  if  'development' == Rails.env

# Recognized
puts 'test6'  if  Rails.env == 'development'

puts 'test7'  if  'development' != Rails.env

puts 'test8'  if  Rails.env != 'development'

rubocop testfile.rb

• Only test 1 and test 6 are flagged by rubocop as needing correction.

RuboCop version

Tested on:
Rubocop version: 0.79
Rubocop-rails version: 2.4.1
Rubocop-performance version: 1.5.2
Ruby version: 2.5.5
Rails version: 4.2.11.1