chore(deps): update dependency codecov to v3.0.4

Author: renovate-bot

package.json

@@ -24,7 +24,7 @@
   "devDependencies": {
     "@types/form-data": "2.2.1",
     "@types/mocha": "5.2.4",
-    "codecov": "3.0.3",
+    "codecov": "3.0.4",
     "dateformat": "3.0.3",
     "execa": "0.10.0",
     "fetch-mock": "6.5.0",