Merge pull request #69 from alex/patch-1

Update travis CI for python 3.8 release

Author: davidhewitt

.travis.yml

@@ -8,9 +8,10 @@ matrix:
     - python: "3.5"
     - python: "3.6"
     - python: "3.7"
-    - python: "3.8-dev"
+    - python: "3.8"
+    - python: "3.9-dev"
   allow_failures:
-    - python: "3.8-dev"
+    - python: "3.9-dev"
 
 install:
   - curl https://sh.rustup.rs -sSf | sh -s -- -y --default-toolchain stable
@@ -33,4 +34,4 @@ script:
   # instead it installs from PyPI!
   - pip install -U pip
   - pip install --no-use-pep517 -e rust_with_cffi/
-  - pytest rust_with_cffi/tests.py
+  - pytest rust_with_cffi/tests.py