chore(deps): update dependency codecov to v3.4.0

Author: renovate-bot

package-lock.json

@@ -19,7 +19,7 @@
   "devDependencies": {
     "@types/form-data": "2.2.1",
     "@types/mocha": "5.2.6",
-    "codecov": "3.3.0",
+    "codecov": "3.4.0",
     "conventional-changelog-cli": "2.0.21",
     "fetch-mock": "6.5.2",
     "http-server": "0.11.1",