update version.

fix swoole_client_select core dump on PHP7.

detect the TLS version.

fix core dump when use wss protocol.

fix compile fail on PHP7.

update example files.

Merge branch 'master' of github.com:swoole/swoole-src

fixed async udp client error.

fix swoole_async_write core dump on PHP7. Fixed swoole#501

use malloc_trim