Docs: Update installation instructions (#348)
Docs: Update installation instructions (#348)

* Docs: Update installation instructions

* Update docs/INSTALLATION.md

Co-authored-by: Colin Caine <939d4f01ab1d04b3ae35deb0b3d3713d91c599f3@gmail.com>

Co-authored-by: Colin Caine <939d4f01ab1d04b3ae35deb0b3d3713d91c599f3@gmail.com>
exercism/xjulia