refactor: remove git push from the postversion script

Closes #24

src/common.ts

@@ -682,8 +682,9 @@ export function getRules(configuration: Configuration): Rules {
     /* tslint:disable-next-line:max-line-length */
     changelog: 'conventional-changelog -p angular -i CHANGELOG.md -s -r 0 && git add CHANGELOG.md && git commit -m \'docs: update changelog\'',
     'check-configuration': 'openstapps-configuration',
-    postversion: 'npm run changelog && git push && git push origin "v$npm_package_version"',
+    postversion: 'npm run changelog',
     preversion: 'npm run prepublishOnly',
+    push: 'git push && git push origin "v$npm_package_version"',
     tslint: 'tslint -p tsconfig.json -c tslint.json \'src/**/*.ts\'',
   };