2.0.0

Normally this would be a minor release (1.1.0), but in the end it is a major release (2.0.0) mainly because of the changes in the C API.
The good news is that Python API stays unchanged!

New features:

• added API for listing of available drivers (#130)
• added API and a CLI option to ignore specified tables (#182)
• added API to get WKB from GeoPackage's geometry encoding (#162)
• more detailed logging of errors from SQLite driver (#135)

Bugs fixed:

• fixed handling of several data types in PostgreSQL
  • uuid (#157)
  • char(N), character(N) (#177)
  • numeric(N, M), decimal(N, M)
• only convert column types to base types when changing driver (#176)

Under the hood:

• C API uses context everywhere: it is safe now to have multiple instances of geodiff in one process (#172)
• use nlohmann/json library for writing of JSON output (#125, #166)
• added cppcheck to CI and fixed various warnings (#165)