Add travis wheel uploads

Author: mmatl

.travis.yml

@@ -5,7 +5,8 @@ env:
     - CIBW_TEST_REQUIRES="nose2"
     - CIBW_TEST_COMMAND="cd {project}/test && nose2"
     - CIBW_SKIP="cp33-* cp34-*"
-    
+    - TWINE_USERNAME=mmatl
+
 matrix:
   include:
     - dist: trusty
@@ -25,3 +26,8 @@ install:
 
 script:
   - cibuildwheel --output-dir wheelhouse
+  - |
+    if [[ $TRAVIS_TAG ]]; then
+      python -m pip install twine
+      python -m twine upload wheelhouse/*.whl
+    fi