Merge pull request #165 from tako3/bugfix

Possibly a bug: Add public access control to AES.Error and ChaCha20.Error

CryptoSwift/AES.swift

@@ -8,7 +8,7 @@
 
 final public class AES {
     
-    enum Error: ErrorType {
+    public enum Error: ErrorType {
         case BlockSizeExceeded
         case InvalidKeyOrInitializationVector
         case InvalidInitializationVector

CryptoSwift/ChaCha20.swift

@@ -8,7 +8,7 @@
 
 final public class ChaCha20 {
     
-    enum Error: ErrorType {
+    public enum Error: ErrorType {
         case MissingContext
     }