Update 2017-04-27.md

Author: DovydasNavickas

docs/2017-04/2017-04-27.md

@@ -138,7 +138,7 @@ When user is typing `discount123`, this is how it looks in the field (also, in t
 
 ![image](https://cloud.githubusercontent.com/assets/7989797/25463183/2646d638-2afd-11e7-95e3-a4812d573435.png)
 
-`Normalizer` enforced all declared rules.
+`Normalizers` enforced all declared rules.
 
 This is how you easily organize and reuse your normalization logic.