ci(travis): properly fetch tags to determine new version

Author: felixfbecker

.travis.yml

@@ -11,6 +11,7 @@ script:
 
 after_success:
  - bash <(curl -s https://codecov.io/bash)
+ - git config --replace-all remote.origin.fetch +refs/heads/*:refs/remotes/origin/*
  - git fetch --tags
  - nvm install 8 && nvm use 8
  - npm install