Fix a few formatting issues

lib/timber/log_devices/io.rb

@@ -25,7 +25,7 @@ def initialize(io = STDOUT, options = {})
         @io = io
       end
 
-      def close(*args)
+      def close(*_args)
         io.close
       end
 

lib/timber/log_devices/io/formatter.rb

@@ -25,7 +25,7 @@ def ansi_format?
           @ansi_format == true
         end
 
-        def format(log_line)
+        def format(_log_line)
           raise NotImplementedError.new("#format is not implemented")
         end
 

lib/timber/macros/logfmt_encoder.rb

@@ -9,7 +9,7 @@ module Macros
     # 2. It makes assumptions about the hash structure, and is designed
     #    specifically for Timber. We can reduce the edge cases and improve
     #    performance drastically.
-    module LogfmtEncoder
+    class LogfmtEncoder
       ARRAY_DELIMITER = ",".freeze
       ARRAY_END = "]".freeze
       ARRAY_START = "[".freeze

lib/timber/probes/active_support_log_subscriber/action_view.rb

@@ -1,7 +1,7 @@
 module Timber
   module Probes
     class ActiveSupportLogSubscriber < Probe
-      module ActionView
+      class ActionView
         def self.render_collection(_log_subscriber, event, &_block)
           wrap(event) { yield }
         end