refactor: disallow HTTP/1 requests

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---

Author: kgryte

lib/node_modules/@stdlib/plot/base/server/lib/main.js

@@ -80,8 +80,7 @@ function createServer( router, clbk ) {
 	// Set require server options for SSL:
 	sopts = {
 		'cert': readFileSync( resolve( KEYS_DIR, 'localhost_cert.pem' ) ),
-		'key': readFileSync( resolve( KEYS_DIR, 'localhost_privkey.pem' ) ),
-		'allowHTTP1': true
+		'key': readFileSync( resolve( KEYS_DIR, 'localhost_privkey.pem' ) )
 	};
 
 	// Create a function to boot a server...