Set codecov status thresholds to 5%

and rename file to be less dotty

Author: meatballhat

Diff for: .github/.codecov.yml

@@ -0,0 +1,9 @@
+comment: false
+coverage:
+  status:
+    project:
+      default:
+        threshold: 5%
+    patch:
+      default:
+        threshold: 5%