Fix pypy on linux and handle OSX.

.travis.yml

@@ -17,13 +17,13 @@ x-pyenv-shard: &x-pyenv-shard
     fi
     "${PYENV}" install --keep --skip-existing ${PYENV_VERSION}
     "${PYENV}" global ${PYENV_VERSION}
-    pip install -U tox "setuptools>=36"
+    pip install -U tox
 
-x-py27: &x-py27 PYENV_VERSION=2.7.15
+x-py27: &x-py27 PYENV_VERSION=2.7.17
 
-x-py37: &x-py37 PYENV_VERSION=3.7.0
+x-py38: &x-py38 PYENV_VERSION=3.8.0
 
-x-pypy: &x-pypy PYENV_VERSION=pypy2.7-6.0.0
+x-pypy: &x-pypy PYENV_VERSION=pypy2.7-7.2.0
 
 x-linux-shard: &x-linux-shard
   os: linux
@@ -38,7 +38,7 @@ x-linux-27-shard: &x-linux-27-shard
 
 x-linux-pypy-shard: &x-linux-pypy-shard
   <<: *x-linux-shard
-  python: pypy2.7-6.0.0
+  python: pypy2.7-7.2.0
 
 x-linux-38-shard: &x-linux-38-shard
   <<: *x-linux-shard
@@ -131,14 +131,14 @@ matrix:
       name: TOXENV=py27
       script: tox -v -e py27
 
-    - <<: *x-osx-37-shard
-      name: TOXENV=py37
-      script: tox -v -e py37
+    - <<: *x-osx-38-shard
+      name: TOXENV=py38
+      script: tox -v -e py38
 
     - <<: *x-osx-27-shard
       name: TOXENV=py27-integration
       script: tox -v -e py27-integration
 
-    - <<: *x-osx-37-shard
-      name: TOXENV=py37-integration
-      script: tox -v -e py37-integration
+    - <<: *x-osx-38-shard
+      name: TOXENV=py38-integration
+      script: tox -v -e py38-integration