switch to using bump

package.json

@@ -24,7 +24,7 @@
  "test": "mocha -t 5000 ./tests/*.js",
  "test:browser": "mocha-headless-chrome -f http://localhost:8080/testrunner.html",
  "testonly": "mocha -t 5000 ./tests/serverevents.spec.js",
- "postversion": "git push && git push --tags"
+ "release": "bump patch --commit --push --tag && npm publish"
  },
  "files": [
  "dist/index.js",