Don't include compiled typescript in git repo

Author: NoahAndrews

.gitignore

@@ -2,3 +2,4 @@ build/
 node_modules/
 .idea/
 prebuilds/
+dist/

dist/binding.d.ts

@@ -22,7 +22,7 @@
     },
     "scripts": {
         "install": "node-gyp-build",
-        "prepublishOnly": "prebuildify --napi",
+        "prepublishOnly": "tsc && prebuildify --napi",
         "pretest": "node-gyp-build && tsc",
         "test": "node --napi-modules test/test_binding.js"
     },