Add tslib

Author: r3nya

packages/react-scripts/package.json

@@ -41,14 +41,15 @@
     "postcss-loader": "2.0.8",
     "promise": "8.0.1",
     "raf": "3.4.0",
-    "source-map-loader": "^0.2.1",
     "react-dev-utils": "^5.0.1",
     "resolve": "1.6.0",
+    "source-map-loader": "^0.2.1",
     "style-loader": "0.19.0",
     "sw-precache-webpack-plugin": "0.11.4",
     "ts-jest": "22.0.1",
     "ts-loader": "^2.3.7",
     "tsconfig-paths-webpack-plugin": "^2.0.0",
+    "tslib": "^1.9.3",
     "tslint": "^5.7.0",
     "tslint-config-prettier": "^1.10.0",
     "tslint-react": "^3.2.0",