Universal Decompositional Semantics (v2.0) and Decomp (v0.3.2)

Adds missing tabulate dependency

Version 0.3.1 successfully fixed the missing semantics module issue, but
introduced a new problem where the package would fail to import due to a
missing tabulate dependency. This version resolves that by adding tabulate
to the main dependencies, where it was originally only a dev dependency.

Changes:

• Add tabulate>=0.9.0 to main dependencies in pyproject.toml
• Users can now install and import decomp without additional manual dependency
  installation
• Package now works out-of-the-box from PyPI

This completes the fix for the PyPI distribution issues. Users should now be
able to:

• pip install decomp
• from decomp import UDSCorpus # works without errors
• import decomp; print(dir(decomp)) # shows all expected modules