How I changed from Travis CI Build Matrix to Build Stages for my side project.
CAULTION: This post was written in April, 2018. Build Stages feature is beta at that time. Things may have changed, but I still want to write it down.
Official documents about how to migrate from Build Matrix to Build Stages are awful.
It took me lots of time and still don't know how to modify it until I met this: Travis CI stage failed in matrix - Stack Overflow
This beta feature is great, although I had already used CircleCI which already had build stages feature at that time.
Maybe write this down can help you save your time.
In the end, I found that the syntax of Build Stages is similar to Build Matrix. I don't know how to explain it, so I'll just put the diff picture and url below:
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