1.9.42

Changelog

6c7d541 Merge pull request #281 from cloudradar-monitoring/csender-hub-fix-linter-warnings
aaa4a17 Simplify code according to golangci-lint warnings
57828d3 config: add sleep setting
270d43a migrate to go modules
40d0368 sleep if POST to hub returns 401
2198d8e sleep if heartbeat returns 401