allow LzoStream.Flush()

fixes #2

src/LzoStream.cs

@@ -479,7 +479,6 @@ public override long Position
 
         public override void Flush()
         {
-            throw new NotSupportedException();
         }
 
         public override int Read(byte[] buffer, int offset, int count)

test/LzoStreamTest.cs

@@ -0,0 +1,40 @@
+//
+// Copyright (c) 2017, Bianco Veigel
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the "Software"),
+// to deal in the Software without restriction, including without limitation
+// the rights to use, copy, modify, merge, publish, distribute, sublicense,
+// and/or sell copies of the Software, and to permit persons to whom the
+// Software is furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+// DEALINGS IN THE SOFTWARE.
+//
+
+using System.IO;
+using System.IO.Compression;
+using Xunit;
+
+namespace lzo.net.test
+{
+    public class LzoStreamTest
+    {
+        [Fact]
+        public void CanFlush()
+        {
+            using (var stream = new LzoStream(new MemoryStream(new byte[]{1}),CompressionMode.Decompress))
+            {
+                stream.Flush();
+            }
+        }
+    }
+}