Do not split --header flag into multiple values #102
Merged
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Replaces pflag.StringSliceVarP with pflag.StringArrayVarP and thus
disallows multiple headers to be defined with a single flag.
Compare https://pkg.go.dev/github.com/spf13/pflag#StringSliceVar
for details.
The previous implementation did not allow header values to contain
a comma, this change fixes that.