Fix variable name in Q11 answer

Should fix lydiahallie#16

Author: mindsers

README.md

@@ -353,7 +353,7 @@ You can't add properties to a constructor like you can with regular objects. If
 
 `Person.prototype.getFullName = () => this.firstName + this.lastName`
 
-would have made `lydia.getFullName()` work. Why is this beneficial? Say that we added this method to the constructor itself. Maybe not every `Person` instance needed this method. This would waste a lot of memory space, since they would still have that property, which takes of memory space for each instance. Instead, if we only add it to the prototype, we just have it at one spot in memory, yet they all have access to it!
+would have made `member.getFullName()` work. Why is this beneficial? Say that we added this method to the constructor itself. Maybe not every `Person` instance needed this method. This would waste a lot of memory space, since they would still have that property, which takes of memory space for each instance. Instead, if we only add it to the prototype, we just have it at one spot in memory, yet they all have access to it!
 
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