Fix README typo

Fix typo in the readme sample command
from 
1b3d73cbf3
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hotatekaoru 2020-02-18 16:06:44 +09:00 committed by Stas
parent 1b3d73cbf3
commit e79406d455

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@ -127,7 +127,7 @@ hash = MovieSerializer.new(movie).serializable_hash
#### Return Serialized JSON
```ruby
json_string = MovieSerializer.new(movie).serializable_hash_hash.to_json
json_string = MovieSerializer.new(movie).serializable_hash.to_json
```
#### Serialized Output