v0.4.0

The new release for pytask v0.4.0 with some improvements.

What's Changed

• Deprecate Python 3.7. by @tobiasraabe in #62
• Align with v0.4.0rc2. by @tobiasraabe in #64
• Deactivate parallelization for dry-runs. by @tobiasraabe in #66
• Update dependencies and syntax. by @tobiasraabe in #67
• Better error message when entering the debugger while parallelizing. by @tobiasraabe in #68

Full Changelog: v0.3.1...v0.4.0