Add configuration for Codecov

.gitattributes

@@ -1,9 +1,8 @@
 .gitattributes     export-ignore
 .github/           export-ignore
 .gitignore         export-ignore
-.travis.yml        export-ignore
+codecov.yml        export-ignore
 docs/              export-ignore
 phpstan.neon       export-ignore
 phpunit.xml.dist   export-ignore
-resources/         export-ignore
 tests/             export-ignore

codecov.yml

@@ -0,0 +1,29 @@
+codecov:
+  require_ci_to_pass: yes
+
+coverage:
+  precision: 2
+  round: down
+  range: "70...100"
+  status:
+    project:
+      default:
+        target: auto
+        threshold: 0%
+    patch:
+      default:
+        target: auto
+        threshold: 0%
+
+parsers:
+  gcov:
+    branch_detection:
+      conditional: yes
+      loop: yes
+      method: no
+      macro: no
+
+comment:
+  layout: "reach,diff,flags,tree"
+  behavior: default
+  require_changes: false