chore(scripts): improve update-gh-pages resilience

package.json

@@ -29,7 +29,7 @@
     "preversion": "npm run readme && npm test",
     "version": "npm run readme && npm run dist && git add -A",
     "postversion": "git push origin master && git push origin --tags && npm publish && npm run update-gh-pages",
-    "update-gh-pages": "git checkout gh-pages && rm _includes/content.md && cp .ignore/content.md _includes/ && git add --all && if git diff --cached --quiet > /dev/null; then :; else git commit -m \"update site\"; fi && git push origin gh-pages && git checkout master",
+    "update-gh-pages": "git checkout gh-pages && rm _includes/content.md && cp .ignore/content.md _includes/ && git add --all && if git diff --cached --quiet > /dev/null; then :; else git commit -m \"update site\"; fi && git push --force origin gh-pages && git checkout master",
     "release": "./tools/release-if-necessary.sh",
     "release-patch": "false",
     "release-minor": "npm version minor -m \"chore(package): release new version\"",