Merge pull request #2157 from google/csharp_remove_beta_notice

Update README.md
diff --git a/csharp/README.md b/csharp/README.md
index ddf1d2b..ed5c7be 100644
--- a/csharp/README.md
+++ b/csharp/README.md
@@ -1,8 +1,5 @@
 This directory contains the C# Protocol Buffers runtime library.
 
-Status: Beta - ready for external testing
-=========================================
-
 Usage
 =====