Update README.md

Author: dy

README.md

@@ -134,7 +134,7 @@ stringify(['+', ['*', 'min', [,60]], [,'sec']])
 
 ## Extending
 
-_Subscript_ provides premade language [features](./features) and API to customize syntax:
+_Subscript_ provides premade language [features](./feature) and API to customize syntax:
 
 * `unary(str, precedence, postfix=false)` − register unary operator, either prefix `⚬a` or postfix `a⚬`.
 * `binary(str, precedence, rassoc=false)` − register binary operator `a ⚬ b`, optionally right-associative.