Fix wrong minimum Go version in README #54

	name: Go tests

	on:
	push:
	branches:
	- master
	pull_request:

	jobs:
	gotests:
	runs-on: ubuntu-20.04
	strategy:
	matrix:
	go-version:
	- "1.20"
	- "1.21"
	name: Tests for Go ${{ matrix.go-version}}
	steps:
	- uses: actions/checkout@v4
	- name: Setup Go
	uses: actions/setup-go@v4
	with:
	go-version: ${{ matrix.go-version }}
	- name: Print env vars
	run: env
	- name: Unit tests
	run: make test
	- name: Check code coverage
	run: ./check_coverage.sh
	- name: Display code coverage
	run: make coverage
	- name: OpenAPI Check
	run: make openapi-check
	- name: REST API Tests
	run: make integration_tests

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