Refactor SubscribeMessage struct to use a map for data field #232

	name: Go
	on: [push]
	jobs:
	build:
	name: Build
	runs-on: ubuntu-latest
	steps:
	- name: Set up Go 1.13
	uses: actions/setup-go@v1
	with:
	go-version: 1.20
	id: go

	- name: Check out code into the Go module directory
	uses: actions/checkout@v1

	- name: Get dependencies
	run: go get -v -t -d ./...

	- name: Test
	run: go test -v .

	- name: Build
	run: go build -v .

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