Added NPM publish via Travis

.travis.yml

@@ -0,0 +1,24 @@
+language: node_js
+
+node_js:
+  - lts/*
+
+os: linux
+
+dist: focal
+
+cache: yarn
+
+script:
+  - travis_retry yarn test
+
+before_deploy:
+  - yarn build
+
+deploy:
+  - provider: npm
+    email: $NPM_EMAIL
+    api_token: $NPM_TOKEN
+    skip_cleanup: true
+    on:
+      tags: true