Prepare v6.0.0 release (1st PS 0.15.0-compatible release) (purescript#81

)

* Update the bower dependencies

* Update Node to 14 in CI

* Update the changelog

Prepare v5.0.0 release (purescript#75)

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.

Merge pull request purescript#53 from masaeedu/newtypealternate

Add newtype instance for Alternate

Merge pull request purescript#50 from Thimoteus/alternate-newtype

re-add Alternate newtype

Merge pull request purescript#49 from purescript/compiler/0.12

Update for PureScript 0.12

Fix `guard` example (purescript#45)

trivial Lazy instance for Unit (purescript#40)

Merge pull request purescript#44 from i-am-tom/master

Add `extend` instance for `Array`

trivial Lazy instance for functions (purescript#38)

* trivial Lazy instance for functions

* make lazyFn defer actually defer fn call

Add tests for this.

* relax types in tests

Merge pull request purescript#37 from purescript/ps-0.11

Update for PureScript 0.11