4.0.0

What's Changed

• Test fixes by @StrongestNumber9 in #45
• Attempts fixing logic for retryAllFailed() by @StrongestNumber9 in #46
• Code cleanup by @StrongestNumber9 in #48
• Relp frame test by @StrongestNumber9 in #50
• Adds RelpParser tests by @StrongestNumber9 in #51
• Remove getState() from RelpParser, add toString() that prints only cu… by @StrongestNumber9 in #56
• Remove unnecessary check by @StrongestNumber9 in #57

Full Changelog: 3.3.1...4.0.0