fix(cmd): Change flag parse error handling

Allows for tests to work w/o calling "exit 1".

internal/cmd/cmd.go

@@ -126,7 +126,7 @@ Examples:
 }
 
 func newFlagSet(name string) (out *flag.FlagSet) {
-	out = flag.NewFlagSet(name, flag.ExitOnError)
+	out = flag.NewFlagSet(name, flag.ContinueOnError)
 	out.SetOutput(os.Stdout)
 	return
 }