fix(typescript): Fix path for typings in package.json

Author: arthurdenner

package.json

@@ -4,7 +4,7 @@
   "description": "A module that formats a string based on a pattern",
   "main": "dist/format-string-by-pattern.umd.js",
   "module": "dist/format-string-by-pattern.es5.js",
-  "typings": "dist/types/format-string-by-pattern.d.ts",
+  "typings": "dist/types/index.d.ts",
   "author": {
     "name": "Arthur Denner",
     "email": "[email protected]"