Compatibility with new StrNode
Compatibility with new StrNode

Node and StrNode look identical, but `eql` fails because the are different
classes. Use `eq` instead.

StrNode was added to RuboCop in
https://github.com/bbatsov/rubocop/pull/5168/commits/6f0904586b50a790efbc3c10be4

bquorning/rubocop-rspec,backus/rubocop-rspec,backus/rubocop-rspec,nevir/rubocop-rspec