fix: don't touch manifest.json

Author: Kelly Selden

package.json

@@ -6,7 +6,7 @@
   "scripts": {
     "lint:git": "commitlint",
     "lint:js": "eslint . --ext js,json",
-    "release": "next release",
+    "release": "next release --package-files package.json --bump-files package.json",
     "test": "mocha test/tests.js"
   },
   "repository": {