Fix typo in README.md

Author: cracksalad

README.md

@@ -64,7 +64,7 @@ The constructor of `LargeArrayBuffer` provides some options:
 1. You can set the threshold when to move the data to disk. When pushing data to the buffer, it is stored in memory until it gets too large.
     E.g.: `new LargeArrayBuffer(512);` to set a 512 MiB threshold. 
 1. You can choose either the PHP serializer, the [igbinary](https://github.com/igbinary/igbinary) serializer or the [msgpack](https://github.com/msgpack/msgpack-php) serializer (PHP serializer is default).
-    E.g.: `new LargeArrayBuffer(serializer: LargeArrayBuffer::COMPRESSION_IGBINARY);`
+    E.g.: `new LargeArrayBuffer(serializer: LargeArrayBuffer::SERIALIZER_IGBINARY);`
 1. You can enable GZIP or LZ4 compression for the serialized items. Although this is recommended only if your items are pretty big like > 1 KiB each. E.g.: `new LargeArrayBuffer(compression: LargeArrayBuffer::COMPRESSION_GZIP);`. Note, that LZ4 compression requires [ext-lz4](https://github.com/kjdev/php-ext-lz4) to be loaded.
 
 ### Read from the buffer
@@ -124,4 +124,4 @@ To reproduce call bench/benchmark.php.
 
 ## License
 
-This library is licensed under the MIT License (MIT). Please see [LICENSE](LICENSE) for more information.
+This library is licensed under the MIT License. Please see [LICENSE](LICENSE) for more information.