Make compatible with swift 3

Source/TPObfuscatedString.swift

@@ -113,6 +113,6 @@ public extension String {
 
 }
 
-private func UC(value: Int) -> String {
-    return String(Character(UnicodeScalar(value)))
-}
+private func UC(_ value: Int) -> String {
+    return String(Character(UnicodeScalar(value)!))
+}

Source/TPObfuscatedStringConverter.swift

@@ -14,8 +14,8 @@ class TPObfuscatedStringConverter {
         let characters = phrase.characters
         var result = [String]()
 
-        let formatter = NSNumberFormatter()
-        formatter.numberStyle = NSNumberFormatterStyle.SpellOutStyle
+        let formatter = NumberFormatter()
+        formatter.numberStyle = NumberFormatter.Style.spellOut
 
         for c in characters {
             let s = String(c).unicodeScalars
@@ -25,7 +25,9 @@ class TPObfuscatedStringConverter {
                 result.append(String(c))
                 break
             case 48...57:
-                result.append(formatter.stringFromNumber(Int(String(c))!)!)
+                let charNum = NSNumber(integerLiteral: Int(String(c))!)
+                let str = formatter.string(from: charNum)!
+                result.append(str)
                 break
             case 32:
                 result.append("space")
@@ -131,8 +133,8 @@ class TPObfuscatedStringConverter {
                 break
             }
         }
-        return result.joinWithSeparator(".")
+        return result.joined(separator: ".")
     }
 
 
-}
+}