Add autocorrect checks to Flycheck, JSON, and TODO formatters

src/ameba/formatter/flycheck_formatter.cr

@@ -5,6 +5,7 @@ module Ameba::Formatter
     def source_finished(source : Source)
       source.issues.each do |e|
         next if e.disabled?
+        next if e.correctable? && config[:autocorrect]?
         if loc = e.location
           @mutex.synchronize do
             output.printf "%s:%d:%d: %s: [%s] %s\n",

src/ameba/formatter/json_formatter.cr

@@ -77,6 +77,7 @@ module Ameba::Formatter
 
       source.issues.each do |e|
         next if e.disabled?
+        next if e.correctable? && config[:autocorrect]?
         json_source.issues << AsJSON::Issue.new(e.rule.name, e.rule.severity.to_s, e.location, e.end_location, e.message)
         @result.summary.issues_count += 1
       end

src/ameba/formatter/todo_formatter.cr

@@ -42,6 +42,7 @@ module Ameba::Formatter
       Hash(Rule::Base, Array(Issue)).new.tap do |h|
         issues.each do |issue|
           next if issue.disabled? || issue.rule.is_a?(Rule::Lint::Syntax)
+          next if issue.correctable? && config[:autocorrect]?
           (h[issue.rule] ||= Array(Issue).new) << issue
         end
       end