v2.0.1

Docs & packaging release — no code changes.

• New "Problems this solves" section in the README mapping common queries (reading NOAA GML CO₂/CH₄ files, loading Mauna Loa flask data into pandas) to read_data
• Corrected the PyPI install note and narrowed the in-situ dialect table to the surveyed (hourly) product
• Expanded keywords; added Source and Bug Tracker project URLs

See CHANGELOG.md for details.