Add jin to codeowners (#175)

diff --git a/CODEOWNERS b/CODEOWNERS
index 6da4f1c..d7feba7 100644
--- a/CODEOWNERS
+++ b/CODEOWNERS
@@ -1 +1 @@
-* @c-parsons @laurentlb
+* @c-parsons @laurentlb @jin