add bump script

.task/bump.sh

@@ -0,0 +1,16 @@
+# bump all workspace package versions as a new prerelease
+NEW_VERSION=$(npm version prerelease --workspaces --git-tag-version | tail -1);
+
+# add each updated package.json, because npm fails to
+git add "packages/core/package.json";
+git add "packages/react/package.json";
+git add "packages/stringify/package.json";
+
+# commit the new version
+git commit -m "$NEW_VERSION";
+
+# create a new tag for the new version
+git tag "$NEW_VERSION";
+
+# push the new version and new tag
+git push && git push --tags;