fix types dir (#87)

Author: copperlight

Diff for: package.json

@@ -1,12 +1,12 @@
 {
   "name": "nflx-spectator",
-  "version": "3.0.0-rc.4",
+  "version": "3.0.0-rc.5",
   "license": "Apache-2.0",
   "homepage": "https://github.com/Netflix/spectator-js",
   "author": "Netflix Telemetry Engineering <[email protected]>",
   "type": "module",
   "main": "cjs/src/index.js",
-  "types": "build/src/index.d.ts",
+  "types": "esm/src/index.d.ts",
   "exports": {
     "import": "./esm/src/index.js",
     "require": "./cjs/src/index.js"