Add frozen_string_literal to subscriber files"

lib/docs/core/subscriber.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'active_support/subscriber'
 
 module Docs
@@ -26,6 +28,7 @@ module Docs
 
     def justify(str)
       return str unless terminal_width
+      str = str.dup
 
       max_length = if tag = str.slice!(/ \[.+\]\z/)
         terminal_width - tag.length

lib/docs/subscribers/doc_subscriber.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Docs
   class DocSubscriber < Subscriber
     self.namespace = 'doc'

lib/docs/subscribers/filter_subscriber.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Docs
   class FilterSubscriber < Subscriber
     self.namespace = 'html_pipeline'

lib/docs/subscribers/progress_bar_subscriber.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'progress_bar'
 
 module Docs

lib/docs/subscribers/request_subscriber.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Docs
   class RequestSubscriber < Subscriber
     self.namespace = 'request'

lib/docs/subscribers/scraper_subscriber.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Docs
   class ScraperSubscriber < Subscriber
     self.namespace = 'scraper'
@@ -12,7 +14,7 @@ module Docs
 
     def ignore_response(event)
       msg = "Ignore:  #{format_url event.payload[:response].url}"
-      msg << " [#{event.payload[:response].code}]" if event.payload[:response].respond_to?(:code)
+      msg += " [#{event.payload[:response].code}]" if event.payload[:response].respond_to?(:code)
       log(msg)
     end
 

lib/docs/subscribers/store_subscriber.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Docs
   class StoreSubscriber < Subscriber
     self.namespace = 'store'