Changelog 🚦🕸️🚄

[!] add REST API, resolves #378 by @pashagolub in #379
[!] provide migration script from v3 to v4 transition, resolves #338 by @pashagolub in #377
[!] rewrite active chain handling by @pashagolub in #382
[+] bump georgysavva/scany 0.3.0 by @dependabot in #374
[+] bump jackc/pgx/v4 to 4.14.0 by @dependabot in #357
[+] bump pashagolub/pgxmock to 1.4.3 by @dependabot in #362
[+] bump spf13/viper to 1.10.1 by @dependabot in #366
[+] bump jackc/puddle to 1.2.1 by @pashagolub in #376
[+] output version information on demand, closes #385 by @pashagolub in #386
[*] save some space for big tables by @ukolovda in #373
[*] use constants for exit codes by @pashagolub in #365

Full Changelog: v4.3.0...v4.4.0
[!] add REST API, resolves #378 83ac6e9
[!] introduce internal web-server for REST API 4ecff4b
[!] provide migration script from v3 to v4 transition, resolves #338 9310da2
[+] add 00381 migration b03b2be
[+] add RestApi section and --rest-port command-line option 83ac6e9
[+] add Scheduler.IsReady() method to be used in REST API 83ac6e9
[+] add Scheduler.status property and RunningStatus constant 83ac6e9
[+] add TestRemoveChainRunStatus() test case 7237986
[+] add timetable.active_chain table and remove timetable.run_status, closes #381, fixes #370 b12c922
[+] add REST API documentation 63c8bee
[+] bump georgysavva/scany to 0.3.0 4888e75
[+] bump jackc/pgx/v4 to 4.14.1 0ce5cff
[+] bump jackc/pgtype to 1.9.1 0ce5cff
[+] bump pashagolub/pgxmock to 1.4.2 740b5e6
[+] bump pashagolub/pgxmock to 1.4.3, merge #362 f1bfbec
[+] bump spf13/viper to 1.10.1 951361b
[+] bump jackc/puddle to 1.2.1 b0f060f
[+] output version information on demand, closes #385 52e1217
[*] enhance PgEngine.Finalize() with cleaning dead chains b12c922
[*] enhance timetable.try_lock_client_name() with cleaning dead chains b12c922
[*] remove Chain.RunStatusID field b12c922
[*] remove PgEngine.FixSchedulerCrash() b12c922
[*] rewrite PgEngine.InsertChainRunStatus() b12c922
[*] remove timetable.get_chain_running_statuses() and timetable.health_check() b12c922
[*] rename and update PgEngine.AddChainRunStatus() to PgEngine.RemoveChainRunStatus() b12c922
[*] return ExitCodeDBEngineError if cannot reconnect in main() b12c922
[*] save some space for big 34a1944
[*] use constants for exit codes 817ec74
[-] fix "error: cannot insert multiple commands into a prepared statement (SQLSTATE 42601)" 81b1f3b
[-] fix parameter naming in dockerfile 8767c87
[-] fix S1023: redundant return statement (gosimple) 672452b