docs(README): fix typo `upgarde` -> `upgrade` (#482) #184

Job	Run time
Lint install-binary.sh	15s
Build & Test	4m 26s
Integration Tests	1m 21s
helm install (ubuntu-latest, default, false)	8s
helm install (macos-latest, default, false)	23s
helm install (windows-latest, default, false)	28s
helm install (windows-latest, wsl, false)	1m 18s
helm install (windows-latest, cygwin, false)	1m 56s
helm install (ubuntu-latest, sh, false, alpine)	11s
	10m 26s

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