Add Flutter tree min version check #248
Merged
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To minimize confusion, and reduce unnecessary issue reports, add a check
during builds that the Flutter tree being used is not older than the
last known point where there was a compatibility break. Instead of a
runtime error, or an unexplained build error, this will fail out during
the engine update step with a clear message to use a newer version of
Flutter.
Currently, this will ensure that people who aren't on Flutter master
will get an error message that's as clear as possible.