Allowing HTTP rate limits to be set by configuration or argument.

src/argv.js

@@ -153,6 +153,16 @@ const { argv } = yargs
 		type: 'number',
 		default: 1,
 	})
+	.option('interval', {
+		describe: 'Minimum wait time between HTTP requests',
+		type: 'number',
+		// don't set default, because argument has to override config, but config has to override default
+	})
+	.option('concurrency', {
+		describe: 'Maximum amount of parallel HTTP requests',
+		type: 'number',
+		// don't set default, because argument has to override config, but config has to override default
+	})
 	.option('save', {
 		describe: 'Save fetched releases to database',
 		type: 'boolean',