chore(travis): activate semantic-release on node-12 test success (#3423)

.travis.yml

@@ -43,4 +43,11 @@ before_script:
   - 'if [ "$LINT" == "true" ]; then npm run lint; fi'
 
 script:
-  - npm run travis
+  - npm run travis
+
+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;

release.config.js

@@ -0,0 +1,22 @@
+module.exports = {
+  // Add logging for releases until we are fully confident of the release solution.
+  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'
+  ]
+}