chore(ci): Setup semantic-release (#247)

* chore(ci): setup semantic-release

* run semantic-release only for push event to master branch and only for node 12 CI runs.

.travis.yml

@@ -14,4 +14,11 @@ before_script:
 script:
   - grunt && ./integration-tests.sh
 
+after_success:
+  # run automated release process with semantic-release
+  - if [[ "$TRAVIS_BRANCH" == "master" && "$TRAVIS_EVENT_TYPE" == "push" && "$TRAVIS_NODE_VERSION" == "12" ]]; then
+      npm i --no-save semantic-release@15 @semantic-release/changelog@3 @semantic-release/git@7;
+      semantic-release;
+    fi;
+
 cache: npm

release.config.js

@@ -0,0 +1,21 @@
+module.exports = {
+  debug: true,
+  branch: 'master',
+  verifyConditions: [
+    '@semantic-release/changelog',
+    '@semantic-release/npm',
+    '@semantic-release/github'
+  ],
+  prepare: [
+    '@semantic-release/changelog',
+    '@semantic-release/npm',
+    '@semantic-release/git'
+  ],
+  publish: [
+    '@semantic-release/npm',
+    '@semantic-release/github'
+  ],
+  success: [
+    '@semantic-release/github'
+  ]
+}