Publish a new PyPI release including the empty `__init__.py` fix and pending bug fixes

[MarketDataDev03]

Title: Publish a new PyPI release including the empty __init__.py fix and pending bug fixes

Problem

The currently published PyPI release (marketdata-sdk-py==1.2.0) ships an empty marketdata/__init__.py, so
top-level imports like from marketdata import MarketDataClient fail. The fix already exists on main
(commit a630ee4, PR #17, merged 2026-02-18 — after the 1.2.0 release on 2026-02-13) but has not been
published.

Reproduction

pip install marketdata-sdk-py==1.2.0
python -c "from marketdata import MarketDataClient"
# ImportError: cannot import name 'MarketDataClient' from 'marketdata'

Suggested fix

No code change needed. Cut a single new release (1.2.1 / 1.3.0) and publish to PyPI once the other open
issues are resolved, so users get the __init__.py fix together with the pending bug fixes in one bundled
release instead of multiple back-to-back versions.

Issues to include in the release

• strike_limit typed as float causes API request to fail #24 — strike_limit typed as float
• Default logging level INFO is too verbose and hard to change #25 — default logging level too verbose
• options.expirations returns an empty DataFrame when columns=["expirations"] is passed #23 — options.expirations empty DataFrame with columns filter

[MarketDataApp]

Released in v1.3.0: https://github.com/MarketDataApp/sdk-py/releases/tag/v1.3.0