Used StyleCop to get rid of tabs in the source code
diff --git a/src/csharp/.gitignore b/src/csharp/.gitignore
index 4f4cd1f..dbaf60d 100644
--- a/src/csharp/.gitignore
+++ b/src/csharp/.gitignore
@@ -1,4 +1,5 @@
 *.userprefs
+StyleCop.Cache
 test-results
 packages
 Grpc.v12.suo