Can't send coverage data to coveralls.io

[koonfoon]

I was tying to create my own project generator. Everything works fine except for the sending data to coveralls.io.
That is, executing jest --coverage always produced a lcov.info with value of absoulte path 'SF:../../home/travis/build/koonfoon/generator-vscode-typescript-jest/generators/app/index.js\n' at the beginning of the file. Which I think wouldn't work with coveralls.io
And I mean always, even in Travis CI (here is the build, executed jest with verbose option). Here is my GitHub repo. How to make it produce relative path instead.
Please advise. Thank you.