export more props of replayer to the UI

package.json

@@ -2,7 +2,8 @@
   "name": "rrweb",
   "version": "0.3.0",
   "description": "record and replay the web",
-  "main": "index.js",
+  "main": "dist/index.js",
+  "module": "dist/module.js",
   "scripts": {
     "test": "TS_NODE_CACHE=false TS_NODE_FILES=true mocha -r ts-node/register test/**/*.ts",
     "bundle": "rollup --config"
@@ -38,6 +39,7 @@
     "typescript": "^3.1.1"
   },
   "dependencies": {
-    "rrweb-snapshot": "file:../snapshot"
+    "mitt": "^1.1.3",
+    "rrweb-snapshot": "^0.4.2"
   }
 }