v0.3.0

This is a major version change. The packaging and installation of deephaven-ib has been significantly reworked with a few objectives:

1. Make Docker optional instead of a requirement.
2. Make it easier to use different versions of ibapi and deephaven.
3. Make it easier to run deephaven-ib.
4. Make it easy to build a Python virtual environment containing a properly configured deephaven-ib environment.

What's Changed

• New example scripts by @chipkent in #105
• Update to Deephaven v0.28 and ibapi to v10.19.01 by @chipkent in #110
• Support historical data bar updates by @chipkent in #113
• Major Update: Replace Docker with virtual environments and update versions by @chipkent in #117

Full Changelog: v0.2.18...v0.3.0