build: make clean dist folder for each release

this obviates the need to parse app version.  but also i found a clue
online that said `twine upload dist/*` was the usual way to run things

tasks.py

@@ -25,36 +25,22 @@ Tasks for tailbone-wave
 """
 
 import os
-import re
 import shutil
 
 from invoke import task
 
 
-here = os.path.abspath(os.path.dirname(__file__))
-__version__ = None
-pattern = re.compile(r'^version = "(\d+\.\d+\.\d+)"$')
-with open(os.path.join(here, 'pyproject.toml'), 'rt') as f:
-    for line in f:
-        line = line.rstrip('\n')
-        match = pattern.match(line)
-        if match:
-            __version__ = match.group(1)
-            break
-if not __version__:
-    raise RuntimeError("could not parse version!")
-
-
 @task
 def release(c):
     """
     Release a new version of tailbone-wave
     """
-    # rebuild local tar.gz file for distribution
+    # rebuild package
+    if os.path.exists('dist'):
+        shutil.rmtree('dist')
     if os.path.exists('tailbone_wave.egg-info'):
         shutil.rmtree('tailbone_wave.egg-info')
     c.run('python -m build --sdist')
 
     # upload to public PyPI
-    filename = 'tailbone-wave-{}.tar.gz'.format(__version__)
+    c.run('twine upload dist/*')
-    c.run('twine upload dist/{}'.format(filename))