Move from travis to github actions (dart-lang/sse#55)

Closes dart-lang/sse#54

Fix formatting in one file.

Remove test expectations around keep alive periods.
Testing communication through the same connection that
had been closed is sufficient for the intent of the test.
8 files changed
tree: 0d681e0950b0199ef19ee8d1d0987a746c9aed45
  1. pkgs/