Add Appveyor CI

Closes #1

.appveyor.yml

@@ -0,0 +1,13 @@
+environment:
+  matrix:
+    - TOXENV: py37
+install:
+  - pip install tox
+build: false
+test_script:
+  - git clone --depth 1 https://github.com/EFForg/https-everywhere
+  - mv https-everywhere ..
+  - tox
+matrix:
+  fast_finish: true
+skip_branch_with_pr: true

README.md

@@ -58,7 +58,7 @@ To test
 
 ```sh
 git clone https://github.com/jayvdb/https-everywhere-py
-git clone https://github.com/EFForg/https-everywhere
+git clone https://github.com/EFForg/https-everywhere  # possibly use --depth 1
 cd https-everywhere-py
 tox
 ```