Restore accidental removal of prepare script 🙈

pirelenito · pirelenito · commit e7310df4530d · 2021-05-05T09:28:37.000+02:00
diff --git a/package.json b/package.json
@@ -19,6 +19,7 @@
     "build": "tsdx build",
     "test": "tsdx test",
     "lint": "tsdx lint",
+    "prepare": "tsdx build",
     "size": "size-limit",
     "analyze": "size-limit --why"
   },
