Signing wheels is no longer a thing.

tasks.py

@@ -50,29 +50,24 @@ def setversion(ctx, version):
     help={
         'clean': 'remove the build/ and dist/ directory before starting',
         'wheel': 'build wheel (in addition to sdist)',
-        'sign': 'sign the wheel',
         'upload': 'upload to PyPI after building'
     }
 )
-def build(ctx, clean=False, wheel=True, sign=True, upload=False):
+def build(ctx, clean=False, wheel=True, upload=False):
     """Build and publish (inv --help build for details)
     """
     os.chdir(DIRNAME)
     if clean:
         ctx.run('rmdir dist /s /q', warn=True)
         ctx.run('rmdir build /s /q', warn=True)
 
-    print("check README.rst syntax..")
-    r = ctx.run("python setup.py check --restructuredtext --strict")
-
     targets = 'sdist'
     if wheel:
         targets += ' bdist_wheel'
     ctx.run("python setup.py " + targets)
 
-    if wheel and sign:
-        for fname in glob.glob('dist/*.whl'):
-            ctx.run('wheel sign ' + fname)
+    print("Check generated .whl files..")
+    ctx.run("twine check dist/*")
 
     # ctx.run("python setup.py build_sphinx")
     if upload: