add pre-publish script

Author: AlexanderEpolite

package.json

@@ -5,7 +5,8 @@
   "main": "dist/index.js",
   "types": "dist/index.d.ts",
   "scripts": {
-    "test": "echo \"Error: no test specified\" && exit 1"
+    "test": "echo \"Error: no test specified\" && exit 1",
+    "prepublish": "tsc"
   },
   "keywords": [
     "tempmail",