refactor: use type switch for checking color type #162

	name: Box CLI Maker

	on:
	push:
	branches: [ master ]
	pull_request:
	branches: [ master ]

	jobs:

	build:
	name: Build
	runs-on: ubuntu-latest
	steps:

	- name: Set up Go 1.x
	uses: actions/setup-go@v2
	with:
	go-version: ^1.15
	id: go

	- name: Check out code into the Go module directory
	uses: actions/checkout@v2

	- name: Get dependencies
	run: \|
	go get -v -t -d ./...
	if [ -f Gopkg.toml ]; then
	curl https://raw.githubusercontent.com/golang/dep/master/install.sh \| sh
	dep ensure
	fi

	- name: Build
	run: go build -o box

	- name: Test
	run: go test -v .

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