Update build tools.

Author: ryanelian

package.json

@@ -16,10 +16,10 @@
     "build": "webpack && webpack --config webpack.config.min.js"
   },
   "devDependencies": {
-    "ts-loader": "^4.3.0",
-    "typescript": "^2.8.3",
-    "webpack": "^4.8.3",
-    "webpack-cli": "^2.1.4"
+    "ts-loader": "^4.3.1",
+    "typescript": "^2.9.1",
+    "webpack": "^4.11.0",
+    "webpack-cli": "^3.0.2"
   },
   "dependencies": {}
 }

tsconfig.json

@@ -5,7 +5,7 @@
     "alwaysStrict": true,
     "strictNullChecks": false,
     "strictFunctionTypes": true,
-    "strictPropertyInitialization": true,
+    "strictPropertyInitialization": false,
     "skipLibCheck": true,
 
     "noUnusedLocals": false,