ci: Test 3.7 on AppVeyor and macOS

Author: 1st1

.ci/appveyor.yml

@@ -12,6 +12,8 @@ environment:
         - PYTHON: "C:\\Python35-x64\\python.exe"
         - PYTHON: "C:\\Python36\\python.exe"
         - PYTHON: "C:\\Python36-x64\\python.exe"
+        - PYTHON: "C:\\Python37\\python.exe"
+        - PYTHON: "C:\\Python37-x64\\python.exe"
 
 branches:
     # Avoid building PR branches.

.travis.yml

@@ -48,11 +48,10 @@ matrix:
           env: BUILD=tests,wheels PYTHON_VERSION=3.5.5
 
         - os: osx
-          osx_image: xcode8.3
           env: BUILD=tests,wheels PYTHON_VERSION=3.6.5
 
-    allow_failures:
-        - python: "3.7-dev"
+        - os: osx
+          env: BUILD=tests,wheels PYTHON_VERSION=3.7.0
 
 cache:
     pip