[post-release] bump version to 0.40.0 (#1777)

* bump version

* update script

Author: charliecruzan-stripe

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@stripe/stripe-react-native",
-  "version": "0.39.0",
+  "version": "0.40.0",
   "author": "Stripe",
   "description": "Stripe SDK for React Native",
   "main": "lib/commonjs/index",

scripts/publish

@@ -131,16 +131,19 @@ yarn -s install --frozen-lockfile
 echo "Running tests"
 yarn -s run test
 
+git checkout -b release-branch-$RANDOM
+
 echo "Bumping package.json $RELEASE_TYPE version and tagging commit"
-yarn -s version --$RELEASE_TYPE
+yarn -s version --"$RELEASE_TYPE"
 
 echo "Publishing release"
 yarn -s --ignore-scripts publish --non-interactive --access=public
+echo "Published to npm!"
 
 echo "Pushing git commit and tag"
 git push --follow-tags
 
-echo "Publish successful!"
+echo "Tag pushed! Please open a PR for your version bump: https://github.com/stripe/stripe-react-native/pulls"
 echo ""
 
 create_github_release