message: Bump travis-ci plugin version
  Due to a bug fix, travis-ci plugin version has to be updated.
diff: "@octokit/rest": "^18.0.0",
  "@roadiehq/backstage-plugin-github-insights": "^0.2.10",
  "@roadiehq/backstage-plugin-github-pull-requests": "^0.6.0",
  - "@roadiehq/backstage-plugin-travis-ci": "^0.2.5",
  + "@roadiehq/backstage-plugin-travis-ci": "^0.2.6",
  "history": "^5.0.0",
  "prop-types": "^15.7.2",
  "react": "^16.12.0",
  