make the context required but nullable in .of()

allow BuildContext to be optional on .of()

2.1.1

add setIfChanged()

2.1.0

remove "value" getter & setter because it causes confusion with Map.v…

…alue!

return the value from waitUntil()
2.0.0

add type annotation

1.1.1

null-safety

1.0.1

update deps

1.0.0

Don't request new frame if not needed

0.3.3
README

refactor

0.3.2