Upgrade typescript to the latest one

Signed-off-by: Kotaro Inoue <[email protected]>

Author: musaprg

package.json

@@ -35,40 +35,49 @@
     }
   },
   "lint-staged": {
-    "src/**/*.{ts,tsx}": ["tslint --fix", "git add"],
-    "{app,spec}/**/*.{rb}": ["bundle exec rubocop", "git add"],
-    "*.{js,css,json,md}": ["prettier --write", "git add"]
+    "src/**/*.{ts,tsx}": [
+      "tslint --fix",
+      "git add"
+    ],
+    "{app,spec}/**/*.{rb}": [
+      "bundle exec rubocop",
+      "git add"
+    ],
+    "*.{js,css,json,md}": [
+      "prettier --write",
+      "git add"
+    ]
   },
   "devDependencies": {
     "@types/katex": "^0.11.0",
-    "@types/marked": "1.1.0",
-    "@types/react": "^16.9.49",
-    "@types/react-dom": "^16.9.8",
-    "@types/react-router": "^4.0.25",
-    "@types/react-router-dom": "^5.1.5",
-    "husky": "^4.2.5",
-    "lint-staged": "^10.2.13",
-    "prettier": "^2.1.1",
-    "ts-loader": "^8.0.3",
+    "@types/marked": "1.2.2",
+    "@types/react": "^16.14.6",
+    "@types/react-dom": "^16.9.12",
+    "@types/react-router": "^4.4.5",
+    "@types/react-router-dom": "^5.1.7",
+    "husky": "^4.3.8",
+    "lint-staged": "^10.5.4",
+    "prettier": "^2.2.1",
+    "ts-loader": "^8.2.0",
     "tslint": "^5.20.1",
     "tslint-config-prettier": "^1.18.0",
     "tslint-microsoft-contrib": "^6.2.0",
     "tslint-plugin-prettier": "^2.3.0",
     "tslint-react": "^4.1.0",
-    "typescript": "^2.9.2",
-    "webpack": "^4.44.1",
+    "typescript": "^4.2.4",
+    "webpack": "^4.46.0",
     "webpack-cli": "^3.3.12"
   },
   "dependencies": {
     "babel-polyfill": "^6.26.0",
     "i18n-webpack-plugin": "^1.0.0",
-    "marked": "^1.1.1",
-    "react": "^16.13.1",
-    "react-dom": "^16.13.1",
+    "marked": "^1.2.9",
+    "react": "^16.14.0",
+    "react-dom": "^16.14.0",
     "react-render-html": "^0.6.0",
     "react-router": "^5.2.0",
-    "react-router-dom": "^5.1.2",
-    "whatwg-fetch": "^3.4.0"
+    "react-router-dom": "^5.2.0",
+    "whatwg-fetch": "^3.6.2"
   },
   "engines": {
     "node": "~12.16",