chore: add semantic-release

Author: horike37

.travis.yml

@@ -23,3 +23,13 @@ script:
 
 after_success:
   - cat ./coverage/lcov.info | ./node_modules/coveralls/bin/coveralls.js && rm -rf ./coverage
+
+jobs:
+  include:
+    - stage: release
+      node_js: lts/*
+      deploy:
+        provider: script
+        skip_cleanup: true
+        script:
+          - npx semantic-release