Migrate deprecated prepublish to prepublishOnly

Author: BrOrlandi

package.json

@@ -9,7 +9,7 @@
     "lint": "eslint src",
     "build": "cross-env BABEL_ENV=production babel src -d lib",
     "debug": "node -r esm --inspect-brk test/index.js",
-    "prepublish": "npm run clean && npm run lint && npm run build"
+    "prepublishOnly": "npm run clean && npm run lint && npm run build"
   },
   "files": [
     "lib",