Simplify report printing

lib/mutant/reporter/cli.rb

@@ -71,7 +71,7 @@ module Mutant
       # @api private
       #
       def report(env)
-        format.write_report(env, output)
+        Printer::EnvResult.run(output, env)
         self
       end
 

lib/mutant/reporter/cli/format.rb

@@ -25,19 +25,6 @@ module Mutant
         #
         abstract_method :progress
 
-        # Write report
-        #
-        # @param [Result::Env] env
-        # @param [IO] output
-        #
-        # @return [String]
-        #
-        # @api private
-        #
-        def write_report(env, output)
-          Printer::EnvResult.run(output, env)
-        end
-
         # Output abstraction to decouple tty? from buffer
         class Output
           include Concord.new(:tty, :buffer)