Specify ssl version range and support TLSv1.2
Specify ssl version range and support TLSv1.2

Newer Ruby/OpenSSL versions (>= 2.1, ships with Ruby >= 2.5) support
specifying a version range via min_version and max_version. Using ranges
where possible will allow clients to connect to hosts that aren't supporting
TLSv1.0 and TLSv1.1 (both of which are deprecated). For consumers on
older ruby versions without version range support, they'll continue
using TLSv1 to prevent upgrade breakage.

heroku/rendezvous.rb