Relax codecov config

codecov.yml

@@ -1,8 +1,37 @@
+# see https://docs.codecov.io/docs/codecov-yaml
+# Validation check:
+# $ curl --data-binary @codecov.yml https://codecov.io/validate
+
 ignore:
   - "**/*.g.dart"
+  - "!**/lib/**" # ignore all files outside of lib
+
+codecov:
+  require_ci_to_pass: yes
+  notify:
+    wait_for_ci: yes
+
+coverage:
+  precision: 0  # 2 = xx.xx%, 0 = xx%
+  round: up # how coverage is rounded: down/up/nearest
+  range: 40...100 # custom range of coverage colors from red -> yellow -> green
+  status:
+    project:
+      default:
+        informational: true
+        target: 70% # specify the target coverage for each commit status
+        threshold: 10% # allow this decrease on project
+        if_ci_failed: error
+    patch:
+      default:
+        informational: true
+        threshold: 50% # allow this decrease on patch
+    changes: false
+
+github_checks:
+    annotations: false
+
 comment:
-  layout: "diff, flags, files"
-  behavior: default
+  layout: header, diff
   require_changes: false
-  require_base: false
-  require_head: true
+  behavior: default