[Fix #8252] Fix a typo for --safe-auto-correct command line option

Fixes #8252.

This PR fixes a command line option name from `--safe-autocorrect`
to `--safe-auto-correct`, which is compatible with RuboCop 0.66 and lower.

Before:

```console
% bundle exec ./exe/rubocop --safe-auto-correct
invalid option: --safe-auto-correct
Did you mean?  safe-autocorrect
For usage information, use --help
```

After:

```console
% bundle exec ./exe/rubocop --safe-auto-correct
--safe-auto-correct is deprecated; use --auto-correct
Inspecting 1082 files
```

CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## master (unreleased)
 
+### Bug fixes
+
+* [#8252](https://github.com/rubocop-hq/rubocop/issues/8252): Fix a command line option name from `--safe-autocorrect` to `--safe-auto-correct`, which is compatible with RuboCop 0.66 and lower. ([@koic][])
+
 ## 0.87.0 (2020-07-06)
 
 ### New features

lib/rubocop/options.rb

@@ -174,8 +174,8 @@ def add_boolean_flags(opts)
       option(opts, '-a', '--auto-correct') do
         @options[:safe_auto_correct] = true
       end
-      option(opts, '--safe-autocorrect') do
-        warn '--safe-autocorrect is deprecated; use --autocorrect'
+      option(opts, '--safe-auto-correct') do
+        warn '--safe-auto-correct is deprecated; use --auto-correct'
         @options[:safe_auto_correct] = @options[:auto_correct] = true
       end
       option(opts, '-A', '--auto-correct-all') do
@@ -472,7 +472,7 @@ module OptionsHelp
       safe:                             'Run only safe cops.',
       list_target_files:                'List all files RuboCop will inspect.',
       auto_correct:                     'Auto-correct offenses (only when it\'s safe).',
-      safe_autocorrect:                 '(same, deprecated)',
+      safe_auto_correct:                '(same, deprecated)',
       auto_correct_all:                 'Auto-correct offenses (safe and unsafe)',
       fix_layout:                       'Run only layout cops, with auto-correct on.',
       color:                            'Force color output on or off.',

spec/rubocop/options_spec.rb

@@ -115,7 +115,7 @@ def abs(path)
               -E, --extra-details              Display extra details in offense messages.
               -S, --display-style-guide        Display style guide URLs in offense messages.
               -a, --auto-correct               Auto-correct offenses (only when it's safe).
-                  --safe-autocorrect           (same, deprecated)
+                  --safe-auto-correct          (same, deprecated)
               -A, --auto-correct-all           Auto-correct offenses (safe and unsafe)
                   --disable-pending-cops       Run without pending cops.
                   --enable-pending-cops        Run with pending cops.
@@ -372,9 +372,9 @@ def abs(path)
       end
     end
 
-    describe '--safe-autocorrect' do
+    describe '--safe-auto-correct' do
       it 'is a deprecated alias' do
-        expect { options.parse %w[--safe-autocorrect] }
+        expect { options.parse %w[--safe-auto-correct] }
           .to output(/deprecated/).to_stderr
       end
     end