tls support, slf4j conversion, minor bug fixes
What's Changed
- RELP_DEBUG environment variable is no longer used, configure sfl4j provider to enable debug and trace output.
- refactor socket operations to use RelpClientSocket abstract class by @kortemik in #18
- Tls by @kortemik in #19
- convert to slf4j from System.out and System.err by @kortemik in #22
- fix cid-325869 by @kortemik in #23
- issue #20 by @kortemik in #24
Full Changelog: 2.1.1...2.2.0