fix visitor's link position

Author: sensorario

behavioral/README.md

@@ -10,4 +10,4 @@ We are going to deal with behaviors instead of define structures or encapsulate
  * [Memento](memento) [:notebook:](https://en.wikipedia.org/wiki/Memento_pattern)
  * [Strategy](strategy) [:notebook:](https://en.wikipedia.org/wiki/Strategy_pattern)
  * [Template](template) [:notebook:](https://en.wikipedia.org/wiki/Template_pattern)
-
+ * [Visitor](visitor) [:notebook:](https://en.wikipedia.org/wiki/Visitor_pattern)

structural/README.md

@@ -12,4 +12,3 @@ relationships.
  * [Decorator](decorator) [:notebook:](https://en.wikipedia.org/wiki/Decorator_pattern)
  * [Flyweight](flyweight) [:notebook:](https://en.wikipedia.org/wiki/Flyweight_pattern)
  * [Proxy](proxy) [:notebook:](https://en.wikipedia.org/wiki/Proxy_pattern)
- * [Visitor](visitor) [:notebook:](https://en.wikipedia.org/wiki/Visitor_pattern)