Add Codecov config [ci skip] (#391)

Author: jakirkham

.github/codecov.yml

@@ -0,0 +1,15 @@
+coverage:
+  status:
+    project:
+      default:
+        target: 100
+        threshold: 0.1
+    patch:
+      default:
+        target: 100
+comment:
+  layout: "diff, files"
+  behavior: default
+  require_changes: true  # if true: only post the comment if coverage changes
+  branches:               # branch names that can post comment
+    - "main"

docs/release.rst

@@ -59,7 +59,8 @@ Maintenance
   By :user:`John Kirkham <jakirkham>`, :issue:`383`.
 
 * Collect coverage on all OSes & enable Codecov.
-  By :user:`John Kirkham <jakirkham>`, :issue:`386`, :issue:`388`.
+  By :user:`John Kirkham <jakirkham>`, :issue:`386`, :issue:`388`,
+  :issue:`390`, :issue:`391`.
 
 .. _release_0.10.2: