Corrected the path of the type definition file

Author: JamesMessinger

package.json

@@ -25,7 +25,7 @@
     "url": "https://github.com/JS-DevTools/rehype-inline-svg.git"
   },
   "main": "lib/index.js",
-  "types": "lib/index.d.js",
+  "types": "lib/index.d.ts",
   "files": [
     "lib"
   ],