Bump up runc version to v1.0.0-rc3

Signed-off-by: Mrunal Patel <mrunalp@gmail.com>
diff --git a/VERSION b/VERSION
index 2136ac9..3a17781 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-1.0.0-rc2
+1.0.0-rc3