* new error collector & improvements for errors
* update golangci-lint, microoptimizations, linter fixes
* UseTLS10 method
* remove dead code
* add 1.17 to the test matrix
* fix for docstring
* split the core package symbols into the subpackages (if feasible)
* all currencies supported in retailCRM"
* function which allows to pick currency symbol without interacting with map
* tweak for new function test
* check for undefined currency code
* increase timeout for failing test
* refactored test to WaitGroup, which resulted in finding and fixing actual data race in the job object
