Update README.md #56

	name: CI

	on:
	push:
	branches:
	- main

	jobs:
	split-upm:
	name: update upm branch
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v2
	with:
	fetch-depth: 0
	- name: update upm branch
	run: \|
	echo '### head info'
	git log -1

	echo '### split upm branch'
	git subtree split -P "$PKG_ROOT" -b upm

	echo '### update remote upm branch'
	git push origin upm
	env:
	PKG_ROOT: Assets/OkapiKit

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