update README.md

Author: halx99

README.md

@@ -32,7 +32,7 @@ cpptest: https://github.com/halx99/mini-asio/blob/master/test/test/cpptest.cpp
 
 lua intergation: 
 1. Compile src\xxsocket.cpp src\masio.cpp src\ibinarystream.cpp src\obinarystream.cpp [src\lmasio.cpp(for c++17) or src\lmasio11.cpp(for c++11)] with your project  
-2. call lua_open_masio after LUA VM initialized.  
+2. call luaopen_masio after LUA VM initialized.  
 luatest(windows user): open https://github.com/halx99/mini-asio/blob/master/test/test/luatest.xsxproj by x-studui365 ide  
 
 #Quick test at linux platform with gcc compiler: