chore: Add types to exports property in package.json (#85)

add types to exports

Author: jimmycallin

package.json

@@ -13,6 +13,7 @@
   "types": "./dist/index.d.ts",
   "exports": {
     ".": {
+      "types": "./dist/index.d.ts",
       "import": "./dist/ftrack-javascript-api.es.js",
       "require": "./dist/ftrack-javascript-api.umd.js"
     }