Update release process to use warehouse rather than legacy PyPI. Ref pypa/warehouse#1422.

.travis.yml

@@ -11,10 +11,11 @@ branches:
   - skeleton
 deploy:
   provider: pypi
+  server: https://upload.pypi.org/legacy/
   on:
     tags: true
     all_branches: true
     python: 3.5
   user: jaraco
   # supply password with `travis encrypt --add deploy.password`
-  distributions: release
+  distributions: dists

setup.cfg

@@ -1,6 +1,10 @@
 [aliases]
-release = clean --all sdist bdist_wheel build_sphinx upload upload_docs
+release = dists build_sphinx upload upload_docs
+dists = clean --all sdist bdist_wheel
 test = pytest
 
 [wheel]
 universal = 1
+
+[upload]
+repository = https://upload.pypi.org/legacy/