Make DisposalScope private

Former-commit-id: 7fcd837fff8b8138ac82b70392e7df221b610128

src/ImageProcessor.Web/NET45/Helpers/AsyncDeDuperLock.cs

@@ -23,7 +23,8 @@ namespace ImageProcessor.Web.Helpers
         /// <summary>
         /// The semaphore slims.
         /// </summary>
-        private static readonly ConcurrentDictionary<string, SemaphoreSlim> SemaphoreSlims = new ConcurrentDictionary<string, SemaphoreSlim>();
+        private static readonly ConcurrentDictionary<string, SemaphoreSlim> SemaphoreSlims
+                                = new ConcurrentDictionary<string, SemaphoreSlim>();
 
         /// <summary>
         /// The lock.
@@ -95,7 +96,7 @@ namespace ImageProcessor.Web.Helpers
         /// <summary>
         /// The disposable scope.
         /// </summary>
-        internal sealed class DisposableScope : IDisposable
+        private sealed class DisposableScope : IDisposable
         {
             /// <summary>
             /// The key