clang-format: Add AfterCaseLabel option from clang-10

Signed-off-by: George Liu <liuxiwei@inspur.com>
Change-Id: I09c677d8063ba333bcc5084341b0719796da0f58
diff --git a/.clang-format b/.clang-format
index 8c5278e..60ceb3c 100644
--- a/.clang-format
+++ b/.clang-format
@@ -21,6 +21,7 @@
 BinPackArguments: true
 BinPackParameters: true
 BraceWrapping:
+  AfterCaseLabel:  true
   AfterClass:      true
   AfterControlStatement: true
   AfterEnum:       true