Add travis configuration file. This will run gren when a tag is

pushed to auto generates release notes

.travis.yml

@@ -0,0 +1,21 @@
+os: linux
+
+dist: bionic
+
+language: node_js
+
+node_js:
+  - 8
+
+stages:
+  - name: generate_release_notes
+    if: tag IS present
+
+jobs:
+  include:
+    - stage: generate_release_notes
+      name: "Generate Release Notes"
+      before_script:
+        - npm install github-release-notes -g
+      script:
+        - gren release