make plugin findable by require.resolve()

Author: lobsterkatie

packages/next-plugin-sentry/package.json

@@ -9,7 +9,7 @@
   "engines": {
     "node": ">=6"
   },
-  "main": "index.js",
+  "main": "./src/on-init-server.js",
   "publishConfig": {
     "access": "public"
   },