Tcp DNS proxy v1.5 released

• migrate py2 to py3

Tcp DNS proxy v1.4 released

1. add internal dns server support
2. daemon code refactor
3. update default config file

Tcp DNS proxy v1.3 released

1. add dns switch function
2. format debug message
3. add new tcpdns.exe binary
4. fix some bugs

Tcp DNS proxy v1.2 released

1. use json config file
2. support private host

Tcp DNS proxy v1.1 released

1. add some options
2. support daemon process on unix like platform

Tcp DNS proxy v1.0 released!

1. add LRU cache support
2. add gevent support