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Purpose
Remove outdated TravisCI settings not to confuse because this project apparently uses GitHub Actions since 60ba54a.
Tests hasn't run on TravisCI for a long time: https://travis-ci.org/github/rails-api/active_model_serializers
Changes
I just removed TravisCI settings and updated some docs for that.
Caveats
N/A
Related GitHub issues
N/A
Additional helpful information
N/A