Fix packaging after switching to hatchling

[mblayman]

I messed up a bunch of things when I switched the packaging to hatchling. This branch corrects the issues.

Fixes #150, #151, #152

unzip tap_py-3.2.1-py3-none-any.whl
Archive:  tap_py-3.2.1-py3-none-any.whl
  inflating: tap/__init__.py         
  inflating: tap/__main__.py         
  inflating: tap/adapter.py          
  inflating: tap/directive.py        
  inflating: tap/formatter.py        
  inflating: tap/line.py             
  inflating: tap/loader.py           
  inflating: tap/main.py             
  inflating: tap/parser.py           
  inflating: tap/rules.py            
  inflating: tap/runner.py           
  inflating: tap/tracker.py          
  inflating: tap/tests/__init__.py   
  inflating: tap/tests/factory.py    
  inflating: tap/tests/test_example.py  
  inflating: tap/tests/testcase.py   
  inflating: tap_py-3.2.1.dist-info/METADATA  
  inflating: tap_py-3.2.1.dist-info/WHEEL  
  inflating: tap_py-3.2.1.dist-info/entry_points.txt  
  inflating: tap_py-3.2.1.dist-info/licenses/AUTHORS  
  inflating: tap_py-3.2.1.dist-info/licenses/LICENSE  
  inflating: tap_py-3.2.1.dist-info/RECORD