0.0.18

PyPI fixes. (#1061)

- Checkout submodules in the PyPI builder to make sure the OSV schema is
included in the built package.
- Make sure the JSON schema is included as a data file. 
- Add missing PyPI package dependencies. This should align with our root
Pipfile.

Part of #1060

0.0.17

PyPI package upgrade.

0.0.14

v0.0.14

Update setup.py for release.

0.0.13

• Update NuGet API endpoint to fix outdated version expansion.

0.0.12

• Fix an import issue.

0.0.11

• NuGet and RubyGems version expansion support

0.0.10

• Fix a version enumeration issue.

0.0.9

v0.0.9

Fix incorrect Semver ecosystem next_version. (#271)

0.0.8

• Add support for Ecosystem.next_version

0.0.7

• Various bug fixes.