Mention the required helm version (#851) #904

Job	Run time
Build & Test	2m 33s
Integration Tests (v3.18.6)	58s
Integration Tests (v3.19.0-rc.1)	55s
helm install (macos-latest, default, false, v3.18.6)	12s
helm install (windows-latest, wsl, false, v3.18.6)	1m 19s
helm install (windows-latest, default, false, v3.19.0-rc.1)	17s
helm install (ubuntu-latest, default, false, v3.18.6)	6s
helm install (ubuntu-latest, default, false, v3.19.0-rc.1)	8s
helm install (windows-latest, default, false, v3.18.6)	25s
helm install (windows-latest, cygwin, false, v3.19.0-rc.1)	1m 19s
helm install (macos-latest, default, false, v3.19.0-rc.1)	10s
helm install (ubuntu-latest, sh, false, v3.18.6, alpine)	11s
helm install (windows-latest, wsl, false, v3.19.0-rc.1)	1m 3s
helm install (ubuntu-latest, sh, false, v3.19.0-rc.1, alpine)	8s
helm install (windows-latest, cygwin, false, v3.18.6)	1m 31s
	11m 15s

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