update typescript

package.json

@@ -50,7 +50,7 @@
     "@types/benchmark": "^1.0.31",
     "@types/express": "^4.11.1",
     "@types/jest": "^22.1.3",
-    "@types/node": "^9.4.6",
+    "@types/node": "^9.6.0",
     "@types/node-fetch": "^1.6.7",
     "@types/react": "^16.0.4",
     "@types/react-dom": "^16.0.4",
@@ -68,7 +68,7 @@
     "rollup-watch": "^4.3.1",
     "ts-jest": "^22.0.4",
     "tslint": "^5.9.1",
-    "typescript": "^2.7.2",
+    "typescript": "^2.8.1",
     "uglify-js": "^3.3.12",
     "util.promisify": "^1.0.0",
     "webpack": "^4.2.0",