v0.4.0 release

What's Changed

• MNT updated pre-commit config to use github for flake8 by @merveenoyan in #221
• DOC add new what's new section to the changelog by @adrinjalali in #229
• MNT Add light type annotations to skops.io by @BenjaminBossan in #219
• MNT add helper functions to convert types to strings in .audit by @E-Aho in #215
• DOC add a community page with link to discord by @adrinjalali in #230
• CI: Update version of GH checkout action by @BenjaminBossan in #232
• ENH: Make skops.io.dump and load work with TextIOWrapper by @BenjaminBossan in #234
• CI fix clean_skops.py by @adrinjalali in #235
• MNT cleanup user links in the changelog by @adrinjalali in #236
• CI add dependabot config for GH actions by @adrinjalali in #239
• CI update setup-python step to v4 by @adrinjalali in #238
• CI Bump pypa/gh-action-pypi-publish from 1.5.0 to 1.6.1 by @dependabot in #240
• ENH All sklearn estimators in trusted list by @EdAbati in #237
• MNT Bump pypa/gh-action-pypi-publish from 1.6.1 to 1.6.4 by @dependabot in #250
• Added save_format to config.json and hub_utils.init() by @merveenoyan in #242
• ENH Persistence: Add support for LightGBM and XGBoost by @BenjaminBossan in #244
• MNT drop python=3.7 support by @adrinjalali in #252
• CI add codecov token to uploader by @adrinjalali in #253
• Alternative Card implementation by @BenjaminBossan in #203
• DOC rework persistence user guide by @adrinjalali in #255

Full Changelog: v0.3.0...v0.4.0