ci: Test Python 3.7 on AppVeyor

Author: 1st1

.ci/appveyor.yml

@@ -0,0 +1,22 @@
+image: ubuntu
+
+stack: python 3.7.0
+
+cache:
+    - /home/appveyor/.cache/pip/wheels/
+
+install:
+    - python --version
+    - git submodule init
+    - git submodule update
+    - python -m pip install --upgrade pip wheel setuptools
+    - python -m pip install --upgrade -r .ci/requirements.txt
+
+build_script:
+    - make
+    - pip install -e .
+
+test_script:
+    - make test
+    - make debug
+    - make test

README.rst

@@ -1,6 +1,9 @@
 .. 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