add exit changeset command

Author: robin-drexler

package.json

@@ -28,7 +28,8 @@
     "restore-consumer-spin": "./scripts/restore-consumer-spin.sh",
     "run:ts": "babel-node --extensions .ts,.tsx,.mjs,.js,.json",
     "run:ts:watch": "nodemon --ext .ts,.tsx,.mjs,.json,.graphql node_modules/.bin/babel-node --extensions .ts,.tsx,.mjs,.js,.json",
-    "type-check": "loom type-check"
+    "type-check": "loom type-check",
+    "changeset:exit-pre-mode": "test -f .changeset/pre.json && jq -e '.mode == \"pre\"' .changeset/pre.json > /dev/null && yarn changeset pre exit || true"
   },
   "devDependencies": {
     "@babel/node": "^7.8.7",