ci: Build under Python 3.6 on macOS

Author: elprans

.travis.yml

@@ -26,6 +26,12 @@ matrix:
           env: BUILD=tests,wheels PYTHON_VERSION=3.5.2 PIP_USER=1
           branches: {only: [releases]}
 
+        - os: osx
+          # Travis macOS env does not support Python yet,
+          # so we have to set things up manually in install.sh.
+          env: BUILD=tests,wheels PYTHON_VERSION=3.6.0 PIP_USER=1
+          branches: {only: [releases]}
+
         - os: linux
           dist: trusty
           sudo: false