Update index.js

Co-authored-by: Jordan Harband <[email protected]>

Author: ChALkeR

index.js

@@ -48,7 +48,7 @@ CipherBase.prototype.update = function (data, inputEnc, outputEnc) {
 		 * Doesn't make sense with other TypedArray instances
 		 */
 		bufferData = Buffer.from(data);
-	} else if (Buffer.isBuffer(data) && data.consructor && data.consructor.isBuffer && data.consructor.isBuffer(data)) {
+	} else if (Buffer.isBuffer(data) && data.constructor && data.constructor.isBuffer && data.constructor.isBuffer(data)) {
 		/*
 		 * Old Buffer polyfill on an engine that doesn't have TypedArray support
 		 * Also, this is from a different Buffer polyfill implementation then we have, as instanceof check failed