Mark ActiveRecordAliases as unsafe autocorrect

We faced an issue where our custom `update_attributes` method call was changed to `update` but the method name remained same in the method definition.

```ruby
def update_attributes
end

update_attributes
```

```ruby
def update_attributes
end

update
```

So the cop is not safe for auto correct.

CHANGELOG.md

@@ -4,6 +4,7 @@
 
 ### New features
 
+* [#98](https://github.com/rubocop-hq/rubocop-rails/issues/78): Mark `Rails/ActiveRecordAliases` as `SafeAutoCorrect` false and disable autocorrect by default. ([@prathames-sonpatki][])
 * [#78](https://github.com/rubocop-hq/rubocop-rails/issues/78): Add new `Rails/EnumHash` cop. ([@fedeagripa][], [@brunvez][], [@santib][])
 
 ### Bug fixes

config/default.yml

@@ -31,6 +31,8 @@ Rails/ActiveRecordAliases:
                   Use `update!` instead of `update_attributes!`.
   Enabled: true
   VersionAdded: '0.53'
+  SafeAutoCorrect: false
+  AutoCorrect: false
 
 Rails/ActiveRecordOverride:
   Description: >-

manual/cops_rails.md

@@ -51,7 +51,7 @@ Include | `app/controllers/**/*.rb` | Array
 
 Enabled by default | Safe | Supports autocorrection | VersionAdded | VersionChanged
 --- | --- | --- | --- | ---
-Enabled | Yes | Yes  | 0.53 | -
+Enabled | Yes | Yes (Unsafe) | 0.53 | -
 
 Checks that ActiveRecord aliases are not used. The direct method names
 are more clear and easier to read.
@@ -66,6 +66,12 @@ Book.update_attributes!(author: 'Alice')
 Book.update!(author: 'Alice')
 ```
 
+### Configurable attributes
+
+Name | Default value | Configurable values
+--- | --- | ---
+AutoCorrect | `false` | Boolean
+
 ## Rails/ActiveRecordOverride
 
 Enabled by default | Safe | Supports autocorrection | VersionAdded | VersionChanged