PHOENIX-7104 Remove phoenix 4.x info from Connectors BUILDING.md #349

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	name: phoenix-connectors preCommit Build

	on:
	pull_request:

	jobs:
	build:
	# upgrade to ubuntu-latest after removing Phoenix 4 support
	runs-on: ubuntu-20.04
	steps:
	- uses: actions/checkout@v1
	- name: Set up JDK 1.8
	uses: actions/setup-java@v1
	with:
	java-version: 1.8
	- name: Test
	run: mvn -B -fae clean install

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