Lint: Style/LineEndConcatenation

I've come around to where I don't mind the backslash.

.rubocop.yml

@@ -135,15 +135,6 @@ Style/GuardClause:
 Style/IfUnlessModifier:
   Enabled: false
 
-# The Ruby Style Guide says:
-#
-# > Use \ instead of + or << to concatenate two string literals at line end.
-#
-# but in my experience the `\` style is rarely used and less readable. Please
-# concatenate multiline strings with `+` or use a HEREDOC.
-Style/LineEndConcatenation:
-  Enabled: false
-
 # Using `module_function` instead of `extend self` would make the instance
 # methods in these modules private. That would be a breaking change, so these
 # modules are excluded. See discussion in:

lib/paper_trail/record_trail.rb

@@ -648,7 +648,7 @@ module PaperTrail
 
     def log_version_errors(version, action)
       version.logger&.warn(
-        "Unable to create version for #{action} of #{@record.class.name}" +
+        "Unable to create version for #{action} of #{@record.class.name}" \
           "##{@record.id}: " + version.errors.full_messages.join(", ")
       )
     end

spec/dummy_app/config/initializers/secret_token.rb

@@ -6,6 +6,6 @@
 # If you change this key, all old signed cookies will become invalid!
 # Make sure the secret is at least 30 characters and all random,
 # no regular words or you'll be exposed to dictionary attacks.
-Dummy::Application.config.secret_token = "99c0312cf416079a8c7ccc63acb1e9f4f" +
-  "17741398ec8022a2f4fb509c57f55b72486573e9816a026f507efbcd452a9e954d45c93c" +
+Dummy::Application.config.secret_token = "99c0312cf416079a8c7ccc63acb1e9f4f" \
+  "17741398ec8022a2f4fb509c57f55b72486573e9816a026f507efbcd452a9e954d45c93c" \
   "95d5bacd87e664ad6805d3f"