Issue #131 Ubuntu 20.04 LTS support
Changes to allow building on both most popular versions of ubuntu: 18.04 and 20.04 LTS. Tested with boost 1.71 and boost 1.65.
Changes to allow building on both most popular versions of ubuntu: 18.04 and 20.04 LTS. Tested with boost 1.71 and boost 1.65.