Bump flit from 1.3 to 2.1.0

[dependabot-preview]

Bumps flit from 1.3 to 2.1.0.

Changelog

Sourced from flit's changelog.

Release history

Version 2.1

• Use compression when adding files to wheels.
• Added the FLIT_INSTALL_PYTHON environment variable (295), to configure flit to always install into a Python other than the one it's running on.
• flit_core uses the intreehooks shim package to load its bootstrapping backend, until a released version of pip supports the standard backend-path mechanism.

Version 2.0

Flit 2 is a major architecture change. The flit_core package now provides a 517 backend for building packages, while flit is a command line interface <cmdline> extending that.

The build backend works on Python 2, so tools like pip should be able to install packages built with flit from source on Python 2. The flit command requires Python 3.5 or above. You will need to change the build-system table in your pyproject.toml file to look like this:

[build-system]
requires = ["flit_core >=2,<3"]
build-backend = "flit_core.buildapi"

Other changes include:

• Support for storing your code under a src/ folder (260). You don't need to change any configuration if you do this.
• Options to control what files are included in an sdist - see pyproject_toml_sdist for the details.
• Requirements can specify a URL 'direct reference', as an alternative to a version number, with the syntax defined in 440: requests @ https://example.com/requests-2.22.0.tar.gz.
• Fix the shebang of scripts installed with the --python option and the --symlink flag (286).
• Installing with --deps develop now installs normal dependencies as well as development dependencies.
• Author email is no longer required in the metadata table (289).
• More error messages are now shown without a traceback (254)

Commits

• 1022269 Version number -> 2.1.0
• 5b3f632 Use intreehooks for bootstrapping flit_core
• 7e65ffc Merge pull request #299 from takluyver/doc-install-targets
• b71df2a Try to clarify how to control where packages are installed
• 4932e21 Clarify flit init a bit in the introduction
• f24a662 Try to fix test for Python 3.5
• 60c1211 Start writing release notes for 2.1
• 4d6be7d Fix crosslinks for command line options in docs
• 45759e5 Move the --repository option under the 'flit publish' subcommand
• d5ae4db Merge branch 'master' of github.com:takluyver/flit
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #7.