Update CLI README.md (#364) #423

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"not expr1 in expr2" is deprecated, use "expr1 not in expr2" instead

Application.get_env/2 is discouraged in the module body, use Application.compile_env/3 instead

Plug.Adapters.Cowboy.http/3 is deprecated. Use Plug.Cowboy.http/3 instead

default values for the optional arguments in to_url/3 are never used

variable "body" is unused (if the variable is not meant to be used, prefix it with an underscore)

Supervisor.Spec.supervise/2 is deprecated. Use the new child specifications outlined in the Supervisor module instead

Supervisor.Spec.supervisor/2 is deprecated. Use the new child specifications outlined in the Supervisor module instead

Mix.Project.compile/1 is deprecated. Use Mix.Task.run("compile", args) instead

Input 'repository' has been deprecated with message: v2 is now available through docker/build-push-action@v2