Add Github Releases deployment

.travis.yml

@@ -23,6 +23,20 @@ jobs:
     sudo: required
   - python: pypy
 
+  - stage: deploy
+    name: Github Releases
+    if: tag IS present
+    install: skip
+    script: flit build
+    deploy:
+      provider: releases
+      api_key: $GITHUB_OAUTH_TOKEN
+      file_glob: true
+      file: dist/*
+      skip_cleanup: true
+      on:
+        tags: true
+
   - stage: deploy
     name: PyPI
     if: tag IS present