diff --git a/.codecov.yml b/.codecov.yml
index 0d870703..4af81695 100644
--- a/.codecov.yml
+++ b/.codecov.yml
@@ -2,8 +2,3 @@ ignore:
   - "doc"
   - "example"
   - "tools"
-
-coverage:
-  precision: 2
-  round: up
-  range: "50...75"
diff --git a/doc/images/wechat.jpg b/doc/images/wechat.jpg
index d17848f1..16fcffcb 100644
Binary files a/doc/images/wechat.jpg and b/doc/images/wechat.jpg differ