Update Travis Config with new versions, wheels

.travis.yml

@@ -4,8 +4,8 @@ python:
   - "3.5"
   - "3.6"
   - "3.7"
-  - "3.7-dev"
-  - "3.8-dev"
+  - "3.8"
+  - "3.9-dev"
   - "nightly"
   # Also test pypy
   - "pypy3"
@@ -19,7 +19,7 @@ script:
 jobs:
   include:
     - stage: build
-      python: "3.7"
+      python: "3.8"
       install: pip install pypandoc
       addons:
         apt_packages: pandoc  # Required to convert the README to a Pypi description
@@ -29,6 +29,7 @@ jobs:
         user: alexgude
         password:
           secure: 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
+        distributions: "sdist bdist_wheel"
         on:
           tags: true
           branch: master