Improvements

#1775 - @d1egoaz - Adds a Producer Interceptor example #1781 - @justin-chen - Refresh brokers given list of seed brokers #1784 - @justin-chen - Add randomize seed broker method #1790 - @d1egoaz - remove example binary #1798 - @bai - Test against Go 1.15 #1785 - @justin-chen - Add private method to Client interface to prevent implementation #1802 - @uvw - Support Go 1.13 error unwrapping

Fixes

#1791 - @stanislavkozlovski - bump default version to 1.0.0