Added missing else and moved else if statement to new line. (#63)

Author: Kevin Hellemun

BunqSdk/Exception/ExceptionFactory.cs

@@ -1,7 +1,11 @@
-using System.Collections.Generic;
+using System;
+using System.Collections.Generic;
 
 namespace Bunq.Sdk.Exception
 {
+    /// <summary>
+    /// This class makes sure that the correct exception is thrown for the given response code.
+    /// </summary>
     public class ExceptionFactory
     {
         /// <summary>

BunqSdk/Http/ApiClient.cs

@@ -302,12 +302,15 @@ private static string DetermineResponseIdByAllHeader(HttpHeaders allHeader)
             if (allHeader.Contains(HEADER_RESPONSE_ID_UPPER_CASE))
             {
                 return allHeader.GetValues(HEADER_RESPONSE_ID_UPPER_CASE).First();
-            } else if (allHeader.Contains(HEADER_RESPONSE_ID_LOWER_CASE))
+            }
+            else if (allHeader.Contains(HEADER_RESPONSE_ID_LOWER_CASE))
             {
                 return allHeader.GetValues(HEADER_RESPONSE_ID_LOWER_CASE).First();
             }
-            
-            throw new BunqException(ERROR_COULD_NOT_DETERMINE_RESPONSE_ID_HEADER);
+            else
+            {
+                throw new BunqException(ERROR_COULD_NOT_DETERMINE_RESPONSE_ID_HEADER);
+            }
         }
 
         private static ApiException CreateApiExceptionRequestUnsuccessful(