Add Rack::Errors#close to satisfy the expected protocol for a logdev of Ruby's core Logger

lib/rackstash/rack/errors.rb

@@ -30,6 +30,12 @@ module Rackstash
         @logger = logger
       end
 
+      # Close the {logger} and all of its adapters
+      # @return [void]
+      def close
+        @logger.close
+      end
+
       # Log a formatted error message to the current buffer of the `logger`. We
       # will format the given message and log it with an `UNKNOWN` severity to
       # the current buffer. Usually, the logger's formatter adds a trailing

spec/rackstash/rack/errors_spec.rb

@@ -53,4 +53,11 @@ RSpec.describe Rackstash::Rack::Errors do
       errors.flush
     end
   end
+
+  describe '#close' do
+    it 'closes the logger' do
+      expect(logger).to receive(:close)
+      errors.close
+    end
+  end
 end