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### Summary
This PR changes .rubocop.yml.
Regarding the code using `if ... else ... end`, I think the coding style
that Rails expects is as follows.
```ruby
var = if cond
a
else
b
end
```
However, the current .rubocop.yml setting does not offense for the
following code.
```ruby
var = if cond
a
else
b
end
```
I think that the above code expects offense to be warned.
Moreover, the layout by autocorrect is unnatural.
```ruby
var = if cond
a
else
b
end
```
This PR adds a setting to .rubocop.yml to make an offense warning and
autocorrect as expected by the coding style.
And this change also fixes `case ... when ... end` together.
Also this PR itself is an example that arranges the layout using
`rubocop -a`.
### Other Information
Autocorrect of `Lint/EndAlignment` cop is `false` by default.
https://github.com/bbatsov/rubocop/blob/v0.51.0/config/default.yml#L1443
This PR changes this value to `true`.
Also this PR has changed it together as it is necessary to enable
`Layout/ElseAlignment` cop to make this behavior.
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|---|---|---|
| .. | ||
| cache.rb | ||
| content_security_policy.rb | ||
| filter_parameters.rb | ||
| filter_redirect.rb | ||
| headers.rb | ||
| mime_negotiation.rb | ||
| mime_type.rb | ||
| mime_types.rb | ||
| parameter_filter.rb | ||
| parameters.rb | ||
| rack_cache.rb | ||
| request.rb | ||
| response.rb | ||
| upload.rb | ||
| url.rb | ||