Apply suggestions from code review

spec/ameba/rule/style/large_numbers_spec.cr

@@ -9,7 +9,7 @@ module Ameba
 
       expect_issue rule, <<-CRYSTAL, number: number
         number = %{number}
-               # ^{number} error: Large numbers should be written with underscores.
+               # ^{number} error: Large numbers should be written with underscores: #{expected}
         CRYSTAL
 
       expect_correction <<-CRYSTAL
@@ -126,7 +126,7 @@ module Ameba
       issue.rule.should_not be_nil
       issue.location.to_s.should eq "source.cr:1:1"
       issue.end_location.to_s.should eq "source.cr:1:7"
-      issue.message.should eq "Large numbers should be written with underscores."
+      issue.message.should match /1_200_000/
     end
 
     context "properties" do

src/ameba/cli/cmd.cr

@@ -91,7 +91,7 @@ module Ameba::Cli
         opts.all = true
       end
 
-      parser.on("-a", "--autocorrect", "Autocorrect issues") do
+      parser.on("--fix", "Autocorrect issues") do
         opts.autocorrect = true
       end
 

src/ameba/rule/style/large_numbers.cr

@@ -33,7 +33,7 @@ module Ameba::Rule::Style
       int_min_digits 5
     end
 
-    MSG = "Large numbers should be written with underscores."
+    MSG = "Large numbers should be written with underscores: %s"
 
     def test(source)
       Tokenizer.new(source).run do |token|
@@ -48,7 +48,7 @@ module Ameba::Rule::Style
             location.line_number,
             location.column_number + token.raw.size - 1
           )
-          issue_for location, end_location, MSG do |corrector|
+          issue_for location, end_location, MSG % expected do |corrector|
             corrector.replace(location, end_location, expected)
           end
         end

src/ameba/runner.cr

@@ -109,7 +109,7 @@ module Ameba
         source.issues.clear
       end
       corrected_issues.reverse_each { |issue| source.issues.unshift(issue) }
-      File.write(source.path, source.code) if corrected_issues.any?
+      File.write(source.path, source.code) unless corrected_issues.empty?
 
       @formatter.source_finished source
     end