Upgrade distro to 1.2.0

[fabaff]

Description:

• Lazily load parsers to speed up import time.
• Don't raise import error on non-linux os.
• Decode stdout of shell sys.getfilesystemencoding().
• Explicitly set Python versions for flake8 tests.

Example entry for configuration.yaml (if applicable):

updater:

Checklist:

If the code communicates with devices, web services, or third-party tools:

• New dependencies have been added to the REQUIREMENTS variable (example).
• New dependencies have been added to requirements_all.txt by running script/gen_requirements_all.py.

If the code does not interact with devices:

• Local tests with tox run successfully. Your PR cannot be merged unless tests pass
• Tests have been added to verify that the new code works.