Update CHANGELOG.md

Prepare v4.0.0 release (1st PS 0.15.0-compatible release) (#24)

* Update the bower dependencies

* Update Node to 14 in CI

* Update the changelog

Prepare v3.0.0 release (#20)

* 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

* Update numbers dependency v7 -> v8

Co-authored-by: Thomas Honeyman <admin@thomashoneyman.com>

Merge pull request #10 from purescript/compiler/0.12

Update for PureScript 0.12

Merge pull request #3 from matthewleon/gc

run gc before benching