fix(logpdf): fix package.json field ordering to match stdlib conventions

Signed-off-by: Kamal Singh Rautela <e22cseu1624@bennett.edu.in>

Author: rautelaKamal

lib/node_modules/@stdlib/stats/base/dists/lognormal/logpdf/package.json

@@ -13,8 +13,8 @@
       "url": "https://github.com/stdlib-js/stdlib/graphs/contributors"
     }
   ],
-  "gypfile": true,
   "main": "./lib",
+  "gypfile": true,
   "directories": {
     "benchmark": "./benchmark",
     "doc": "./docs",