Remove unnecessary line break from exception message

This removes the unnecessary line break from the exception message. Example:

```
Cannot infer root key from collection type. Please\n
specify the root or each_serializer option, or render a JSON String
```
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Vinicius Brasil 2018-10-24 14:10:59 -03:00 committed by GitHub
parent eb865c276d
commit bcf21ea0a6
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@ -47,8 +47,7 @@ module ActiveModel
# 4. key may be nil for empty collection and no serializer option
key &&= key.pluralize
# 5. fail if the key cannot be determined
key || fail(ArgumentError, 'Cannot infer root key from collection type. Please
specify the root or each_serializer option, or render a JSON String')
key || fail(ArgumentError, 'Cannot infer root key from collection type. Please specify the root or each_serializer option, or render a JSON String')
end
# rubocop:enable Metrics/CyclomaticComplexity