Add matrix with windows job

.travis.yml

@@ -9,6 +9,19 @@ addons:
       - python-qt4
       - tor
       - xvfb
+jobs:
+  allow_failures:
+    - os: windows
+  include:
+    - dist: xenial
+    - os: windows
+      # if: type = pull_request
+      before_install:
+        - choco install python2
+        - python -m pip install --upgrade pip
+        - python -m pip install psutil pycrypto
+      env:
+        - PATH=/c/Python27:/c/Python27/Scripts:$PATH
 install:
   - pip install -r requirements.txt
   - ln -s src pybitmessage  # tests environment