v2022.08.18

What's Changed

Mismatched ruby versions - updated to 2.6.9 by @2600box in https://github.com/huginn/huginn/pull/3058
Drop BasecampAgent by @knu in https://github.com/huginn/huginn/pull/3056
made mysql flush appear as code by @2600box in https://github.com/huginn/huginn/pull/3059
Migrate from RR to RSpec Mocks by @knu in https://github.com/huginn/huginn/pull/3066
fix error 'tried to create Proc object without a block' in Gemfile by @JaHIY in https://github.com/huginn/huginn/pull/3097
Upgrade mini_racer to the latest version by @knu in https://github.com/huginn/huginn/pull/3103
Add a Liquid variable referring to the agent itself as _agent_ by @knu in https://github.com/huginn/huginn/pull/3104
Force setup_heroku to use heroku-18 stack by @nighthawk in https://github.com/huginn/huginn/pull/3124
Update gems for ruby 2.7 by @knu in https://github.com/huginn/huginn/pull/3130
Upgrade Ruby to 2.7 by @knu in https://github.com/huginn/huginn/pull/3055
Fix ImapFolderAgent documentation regarding mime_types by @axsuul in https://github.com/huginn/huginn/pull/3146

@2600box made their first contribution in https://github.com/huginn/huginn/pull/3058
@JaHIY made their first contribution in https://github.com/huginn/huginn/pull/3097
@nighthawk made their first contribution in https://github.com/huginn/huginn/pull/3124

Full Changelog: https://github.com/huginn/huginn/compare/v2022.01.04...v2022.08.18