Updated README to include new int to roman function (#355)

Author: brandenc40

README.md

@@ -22,7 +22,8 @@ Read our [Contribution Guidelines](CONTRIBUTING.md) before you contribute.
 * [Xor](./cipher/xor/xor.go)
 
 ### Conversions
-* [Roman To Integer](./conversion/romantointeger.go)
+* [Roman Numeral To Integer](./conversion/romantointeger.go)
+* [Integer To Roman Numeral](./conversion/integertoroman.go)
 
 ### Data Structures
 * [AVL Tree](./structure/avl/avl.go)

conversion/romantointeger.go

@@ -49,7 +49,7 @@ func RomanToInteger(input string) (int, error) {
 		}
 	}
 	// if we are still left with input string values then the
-	// input was invalid and the bool is returned as false
+	// input was invalid and an error is returned.
 	if len(input) > 0 {
 		return 0, errors.New("invalid roman numeral")
 	}