[ERROR] wrong codecov config

[Alex Yang]

this problem still appears at the master branch.

I think the reason is incorrect .travis.yml config

in TravisCI

> codecov
  _____          _  
 / ____|        | |  
| |     ___   __| | ___  ___ _____   __  
| |    / _ \ / _` |/ _ \/ __/ _ \ \ / /  
| |___| (_) | (_| |  __/ (_| (_) \ V /  
 \_____\___/ \__,_|\___|\___\___/ \_/  
                                v3.1.0
==> Detecting CI Provider
    Travis CI Detected
==> Configuration: 
    Endpoint: https://codecov.io
{ commit: '37739fe1bbcc88f54d40fe96f97e74a146f16623',
  branch: 'master',
  package: 'node-v3.1.0' }
==> Building file structure
==> Generating gcov reports (skip via --disable=gcov)
    $ find /home/travis/build/Himself65/kuen -type f -name '*.gcno'  -exec gcov  {} +
==> Scanning for reports
    X Failed to read file at 
==> Uploading reports
    Success!
    View report at: https://codecov.io/github/Himself65/kuen/commit/37739fe1bbcc88f54d40fe96f97e74a146f16623