Add ruby 2.6 and activesupport 6.0 to CI#211

fonji wants to merge 2 commits into

HubspotCommunity:masterHubspotCommunity/hubspot-ruby:masterfrom

fonji:ruby_2_6_and_active_support_6fonji/hubspot-ruby:ruby_2_6_and_active_support_6Copy head branch name to clipboard