Enable 3.7 CI on Travis; drop AppVeyor

Special thanks to @waghanza (pr #179) for working on this change.

.travis.yml

@@ -3,7 +3,7 @@ language: generic
 env:
     global:
         - PYMODULE=uvloop
-        - RELEASE_PYTHON_VERSIONS="3.5 3.6"
+        - RELEASE_PYTHON_VERSIONS="3.5 3.6 3.7"
 
         - S3_UPLOAD_USERNAME=oss-ci-bot
         - S3_UPLOAD_BUCKET=magicstack-oss-releases
@@ -37,11 +37,14 @@ matrix:
 
         - os: osx
           osx_image: xcode7.3
-          # 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=3.6.5
           branches: {only: [releases]}
 
+        - os: osx
+          osx_image: xcode7.3
+          env: BUILD=tests,wheels PYTHON_VERSION=3.7.0
+          branches: {only: [releases]}
+
         - os: linux
           dist: trusty
           sudo: false
@@ -56,6 +59,13 @@ matrix:
           python: "3.6"
           env: BUILD=tests
 
+        - os: linux
+          dist: xenial
+          sudo: required
+          language: python
+          python: "3.7"
+          env: BUILD=tests
+
         - os: linux
           dist: trusty
           branches: {only: [releases]}

README.rst

@@ -1,9 +1,6 @@
 .. image:: https://travis-ci.org/MagicStack/uvloop.svg?branch=master
     :target: https://travis-ci.org/MagicStack/uvloop
 
-.. image:: https://ci.appveyor.com/api/projects/status/4apd79e5jqrwwe40/branch/master?svg=true
-    :target: https://ci.appveyor.com/project/MagicStack/uvloop
-
 .. image:: https://img.shields.io/pypi/v/uvloop.svg
     :target: https://pypi.python.org/pypi/uvloop