Issue kodecocodes#240 (generic example) (kodecocodes#255)

* Use `swap` for single uppercase letter generic parameter example (kodecocodes#240)

* Add Jessy Catterwaul to the credits

Author: JessyCatterwaul

CREDITS.markdown

@@ -6,6 +6,7 @@ It is a collaborative effort from the most stylish raywenderlich.com team member
 * [Jawwad Ahmad](https://github.com/jawwad)
 * [Soheil Moayedi Azarpour](https://github.com/moayes)
 * [Scott Berrevoets](https://github.com/Scott90)
+* [Jessy Catterwaul](https://github.com/JessyCatterwaul)
 * [Eric Cerney](https://github.com/ecerney)
 * [Sam Davies](https://github.com/sammyd)
 * [Evan Dekhayser](https://github.com/edekhayser)

README.markdown

@@ -152,14 +152,14 @@ Generic type parameters should be descriptive, upper camel case names. When a ty
 ```swift
 struct Stack<Element> { ... }
 func write<Target: OutputStream>(to target: inout Target)
-func max<T: Comparable>(_ x: T, _ y: T) -> T
+func swap<T>(_ a: inout T, _ b: inout T)
 ```
 
 **Not Preferred:**
 ```swift
 struct Stack<T> { ... }
 func write<target: OutputStream>(to target: inout target)
-func max<Thing: Comparable>(_ x: Thing, _ y: Thing) -> Thing
+func swap<Thing>(_ a: inout Thing, _ b: inout Thing)
 ```
 
 ### Language