Added `tailRec2`, `tailRec3`, `loop2`, `loop3` convenience functions

Prepare v6.0.0 release (1st PS 0.15.0-compatible release) (#39)

* Update the bower dependencies

* Update Node to 14 in CI

* Update the changelog

Prepare v5.0.0 release (#36)

* Update CI to build with the latest version of the compiler

* Update the bower repository URL to match the URL in the registry

* Upgrade bower dependencies

* Update the changelog

add whileJust and untilJust (#27)

* add whileJust and untilJust

* purescript-assert to dev

* un maybe

* new lines

Merge pull request #24 from purescript/compiler/0.12

Updates for 0.12

add monadRecMaybe (#21)

fix #20

implement MonadRec for Function (#18)

remove a space leak in tailRecEff (#19)

tailRecEff was holding a reference to the result of f' a.

Normally, this wouldn't matter, but in this case we are about
to enter a loop that may last a long time, so it is better to let
the GC clean up the result of f' a before.