Some small README improvements.
Some small README improvements.

LinkedDestiny/swoole-src,swoole/swoole-src,tutanhamon/swoole-src,swoole/swoole-src,swoole/swoole-src,tutanhamon/swoole-src,tutanhamon/swoole-src,LinkedDestiny/swoole-src,LinkedDestiny/swoole-src,tutanhamon/swoole-src,swoole/swoole-src,swoole/swoole-src,tutanhamon/swoole-src,LinkedDestiny/swoole-src,LinkedDestiny/swoole-src,swoole/swoole-src,swoole/swoole-src,tutanhamon/swoole-src,LinkedDestiny/swoole-src,LinkedDestiny/swoole-src,tutanhamon/swoole-src