Fix ameba issues

.ameba.yml

@@ -29,3 +29,6 @@ Metrics/CyclomaticComplexity:
 
 Naming/BlockParameterName:
   Enabled: false
+
+Naming/AccessorMethodName:
+  Enabled: false

src/procodile/core_ext/process.cr

@@ -1,6 +1,6 @@
 class ::Process
   # override ::Process.fork in stdlib for suppress the warning message.
-  def self.fork(&block) : Process
+  def self.fork(&) : Process
     new Crystal::System::Process.fork { yield }
   end
 end

src/procodile/tcp_proxy.cr

@@ -83,9 +83,9 @@ module Procodile
         end
         readers = {:backend => backend_socket, :client => client}
         loop do
-          io = IO.select(readers.values, nil, nil, 0.5)
-          if io && io.first
-            io.first.each do |io|
+          ios = IO.select(readers.values, nil, nil, 0.5)
+          if ios && ios.first
+            ios.first.each do |io|
               readers.keys.each do |key|
                 next unless readers[key] == io
                 opposite_side = key == :client ? :backend : :client