0.9.0 Latest features from the upstream repo. Add `gh-team-whitelist` command line argument

Important note

Users are advised to upgrade to release 0.9.0.2

The gh-team-whitelist feature in this release has known deficits and should not be relied on. Users are advised to upgrade to release 0.9.0.2 as soon as possible.

what

• Upgrade to the latest release from runatlantis (https://github.com/runatlantis/atlantis/releases/tag/v0.9.0)
• Add gh-team-whitelist command line argument
• Use bigger atlantis logo on the web pages

why

• Use the latest features from the upstream repo
• Improved security
• Explicitly specify GitHub teams and operations (plan, apply) that the members of a team are allowed to perform. Only the users from the whitelisted teams will be able to perform the actions
• runatlantis#783