Fix typo

Author: doomsower

package.json

@@ -3,7 +3,7 @@
   "version": "3.1.0",
   "description": "Markdown renderer for react-native, with CommonMark spec support + adds syntax extensions & sugar (URL autolinking, typographer).",
   "main": "src/index.js",
-  "typesc": "src/index.d.ts",
+  "types": "src/index.d.ts",
   "scripts": {},
   "repository": {
     "type": "git",