update readme

Author: AxiosLeo

README.md

@@ -2,7 +2,7 @@
 
 - [ForkProcess](./src/ForkProcess.php) - multi-process development tool
 - [Helper](./src/Helper.php) - helper function
-- [MemoryCounter](./src/MemoryCounter.php) - base on memory counter
+- [MemoryCounter](./src/MemoryCounter.php) - counter base on memory
 - [NumberSystemConvert](./src/NumberSystemConvert.php) - for convert number system
 - [RSACrypt](./src/RSACrypt.php) - RSA crypt tool