1. Set nodelay on sockets.

2. Increased the buffer size during read and write process.
3. Shorten the intervel in resolving addresses.

Merge pull request zhboner#27 from zephyrchien/less-thread_fix-udp

Use less thread & Fix UDP

update package info

remove uncessary info

Optimize the efficiency

Optimize the efficiency

format the code

Update relay.yml

support UDP

Update readme.md