[minor] Use Array.prototype.includes()

Use `Array.prototype.includes()` instead of `Array.prototype.indexOf()`.

Author: lpinca

lib/websocket.js

@@ -87,7 +87,7 @@ class WebSocket extends EventEmitter {
   }
 
   set binaryType(type) {
-    if (constants.BINARY_TYPES.indexOf(type) < 0) return;
+    if (!constants.BINARY_TYPES.includes(type)) return;
 
     this._binaryType = type;
 
@@ -449,7 +449,7 @@ function initAsClient(address, protocols, options) {
     }
   );
 
-  if (protocolVersions.indexOf(options.protocolVersion) === -1) {
+  if (!protocolVersions.includes(options.protocolVersion)) {
     throw new RangeError(
       `Unsupported protocol version: ${options.protocolVersion} ` +
         `(supported versions: ${protocolVersions.join(', ')})`
@@ -588,7 +588,7 @@ function initAsClient(address, protocols, options) {
       protError = 'Server sent a subprotocol but none was requested';
     } else if (protocols && !serverProt) {
       protError = 'Server sent no subprotocol';
-    } else if (serverProt && protList.indexOf(serverProt) === -1) {
+    } else if (serverProt && !protList.includes(serverProt)) {
       protError = 'Server sent an invalid subprotocol';
     }