chore(system): adapt push scripts

Author: marionebl

package.json

@@ -16,7 +16,7 @@
     "commit": "git-cz",
     "commitmsg": "node distribution/cli.js --edit",
     "changelog": "conventional-changelog --preset angular --infile changelog.md --same-file --output-unreleased",
-    "push": "git push && git push --tags && hub release create \"v$(cat .git/RELEASE_VERSION.tmp)\" --message=\"v$(cat .git/RELEASE_VERSION.tmp)\n$(cat .git/COMMITMSG.tmp)\" && npm publish && rm .git/RELEASE_VERSION.tmp && rm .git/COMMITMSG.tmp",
+    "push": "git push && git push --tags && hub release create \"v$npm_package_version\" --message=\"v$npm_package_version\n$(conventional-changelog -p angular)\" && npm publish",
     "test": "eslint *.js && jsonlint-cli *.json && node distribution/cli.js --from=HEAD~1",
     "preversion": "npm run build && npm test",
     "release": "npm version --no-git-tag-version $(conventional-recommended-bump -p angular)",