Change the Attachment type from string to []byte. This allows images to be created with attachments #152

	name: Go

	on: [push, pull_request]

	jobs:
	build:

	runs-on: ubuntu-latest
	strategy:
	matrix:
	go-version: [ '1.18', '1.19', '1.20' ]

	steps:
	- uses: actions/checkout@v3
	- name: Setup Go ${{ matrix.go-version }}
	uses: actions/setup-go@v3
	with:
	go-version: ${{ matrix.go-version }}
	- name: Build
	run: go build -v ./...
	- name: Test
	run: go test -coverprofile=coverage.txt -v ./...
	- name: Upload code coverage results
	uses: codecov/codecov-action@v3
	with:
	token: ${{ secrets.CODECOV_TOKEN }}
	fail_ci_if_error: false
	verbose: true

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