expose an untyped EffectAwaiter

bundle xml docs in the nuget package

add a changelog

fix spacing

make handlers return ValueTask

Implement a call/cc sample (#24)

* Add a call/cc sample

* minor refactorings

* use continuations in NonDet sample

* add implicit operator for converting Effects to Eff

* add comments

* simplify continuation evaluation code

* add more comments

* fix docs issues

* simplify maybe sample

* add comments

Remove unused usings

Merge branch 'master' of https://github.com/nessos/Eff

Support awaiting arbitrary INotifyCompletion types (#22)

* Support awaiting arbitrary INotifyCompletion types

* minor renamings

* minor refactoring

* remove EffAwaiter.Clear()

* replace flaky test

* add missing xml doc

fix eff exception stacktraces