Minor bugfix release

This release includes:
- Log configuration on proxy start - 9seconds#52
- Prometheus exports only mtg metrics - 9seconds#53
- Documentation updates - 9seconds#55, 9seconds#56
- Remove generation of version.go file - 9seconds#57

Prometheus support

Add Secure-only mode

Fixes for middle proxies configuration format

v0.12

- Small improvements on connection management

v0.11

- Fix for IPv6 address detection
- Possibility to setup read/write buffers
- Make connection aborts more predictable

Support of secure mode

- Support of secure mode (dd-secrets)
- Export data to statsd

Promoted channels and direct mode

- Support of promoted channels
- Support of direct connection