It seems that migrating CI from Travis to GitHub Actions was completed at #521.
This PR removes .travis.yml and replaces the CI status badge.
And I also removed Gemnasium badge because gemnasium.com was closed on May 15, 2018.
https://gitlab-docs.creationline.com/ee/user/project/import/gemnasium.html
I know that the shared actions/workflows are being considered at #523,
but it seems to have stalled, so I created this PR.
It seems that migrating CI from Travis to GitHub Actions was completed at #521. This PR removes
.travis.ymland replaces the CI status badge. And I also removed Gemnasium badge because gemnasium.com was closed on May 15, 2018. https://gitlab-docs.creationline.com/ee/user/project/import/gemnasium.htmlI know that the shared actions/workflows are being considered at #523, but it seems to have stalled, so I created this PR.