Migrate to codecov.yml (#2927)

* Migrate to codecov.yml

* correct syntax, 4 space indents
diff --git a/codecov.yml b/codecov.yml
new file mode 100644
index 0000000..2bfc815
--- /dev/null
+++ b/codecov.yml
@@ -0,0 +1,9 @@
+comment: false
+coverage:
+    status:
+        patch:
+            default:
+                target: '100'
+        project:
+            default:
+                target: '100'