Upgrade dependencies

package.json

@@ -17,21 +17,20 @@
   "author": "Matúš Námešný",
   "license": "MIT",
   "dependencies": {
-    "async": "^2.5.0",
+    "async": "^3.1.0",
     "express": "^4.13.4",
-    "express-static-gzip": "^1.1.3",
-    "front-matter": "^2.2.0",
-    "js-yaml": "^3.13.1",
-    "jsonfile": "^4.0.0",
+    "express-static-gzip": "^2.0.5",
+    "front-matter": "^3.0.2",
+    "jsonfile": "^5.0.0",
     "lodash": "^4.17.13",
-    "markdown-it": "^8.4.2",
+    "markdown-it": "^10.0.0",
     "moment": "^2.24.0",
     "node-sass": "^4.9.0",
     "prop-types": "^15.7.2",
     "react": "^16.7.0",
     "react-dom": "^16.7.0",
-    "react-router-dom": "^4.1.1",
-    "serialize-javascript": "^1.6.1"
+    "react-router-dom": "^5.0.1",
+    "serialize-javascript": "^2.1.0"
   },
   "devDependencies": {
     "@babel/core": "^7.2.2",
@@ -46,27 +45,27 @@
     "babel-eslint": "^10.0.1",
     "babel-loader": "^8.0.5",
     "babel-plugin-css-modules-transform": "^1.6.2",
-    "clean-webpack-plugin": "^0.1.19",
-    "compression-webpack-plugin": "^1.1.11",
+    "clean-webpack-plugin": "^3.0.0",
+    "compression-webpack-plugin": "^3.0.0",
     "create-file-webpack": "^1.0.2",
-    "css-loader": "^0.28.11",
+    "css-loader": "^3.2.0",
     "css-modules-require-hook": "^4.2.3",
-    "eslint": "^5.14.0",
-    "eslint-config-standard": "^12.0.0",
+    "eslint": "^6.4.0",
+    "eslint-config-standard": "^14.1.0",
     "eslint-plugin-babel": "^5.3.0",
     "eslint-plugin-import": "^2.16.0",
-    "eslint-plugin-node": "^8.0.1",
+    "eslint-plugin-node": "^10.0.0",
     "eslint-plugin-promise": "^4.0.1",
     "eslint-plugin-react": "^7.12.4",
     "eslint-plugin-standard": "^4.0.0",
-    "file-loader": "^1.1.11",
-    "mini-css-extract-plugin": "^0.4.0",
-    "optimize-css-assets-webpack-plugin": "^4.0.2",
-    "postcss-loader": "^2.1.4",
-    "sass-loader": "^7.0.1",
-    "style-loader": "^0.21.0",
+    "file-loader": "^4.2.0",
+    "mini-css-extract-plugin": "^0.8.0",
+    "optimize-css-assets-webpack-plugin": "^5.0.3",
+    "postcss-loader": "^3.0.0",
+    "sass-loader": "^8.0.0",
+    "style-loader": "^1.0.0",
     "uglifyjs-webpack-plugin": "^2.1.3",
-    "url-loader": "^0.5.9",
+    "url-loader": "^2.1.0",
     "webpack": "^4.7.0",
     "webpack-cli": "^3.3.4",
     "webpack-dev-middleware": "^3.1.3",