v0.7.0

Release notes

Added

• New documentation files in docs folder: development_guide.md,
  getting_started.md, how_east_works.md
• make format command, which uses black and isort.
  development_guide.md explains the use.
• Both commands east util connect and east util rtt now accept
  --rtt-port option, which sets the RTT Telnet port. Command
  east util connect now also accepts the --jlink-id option, same as
  east flash. With those new options is now easier to connect and listen to
  RTT messages from multiple JLink devices.

Changed

• Updated readme so it points to the new documentation.

Fixed

• Fixed release artefacts naming issue where build type would not appear
  correctly.
• Create a release_dry_run folder instead of release folder when using
  --dry-run option with east release command.
• east release command now runs a pre-check on the apps and samples from
  east.yml, if they exists before running the release process. That way you
  can catch a typo, or a mistake before you spent some time waiting through
  the release process.