Merge pull request #910 from oasisprotocol/lw/codecov

Allow codecov coverage to drop by 0.5%

.codecov.yml

@@ -2,21 +2,15 @@
 comment:
   layout: "reach, diff, flags, files"
   behavior: default
-  require_changes: false
+  # Only post codecov comments when coverage changes
+  require_changes: true
   require_base: true
   require_head: true
   branches: null
 
-flag_management:
-  default_rules:
-    carryforward: boolean?
-    ignore: [path]?
-    paths: [path]?
-    statuses: [ #note, statuses are an array
-      name_prefix: string (r"^[\w\-\.]+$")
-      type: OR("project", "patch", "changes")
-      target: OR("auto", percent)?
-      include_changes: OR("auto", precent)?
-      threshold: percent?
-      **normal status attributes
-    ]?
+coverage:
+  status:
+    project:
+      default:
+        # Allow the coverage to drop by 0.5%
+        threshold: 0.5%