Updated dev dependencies

package.json

@@ -1,6 +1,6 @@
 {
   "name": "simple-keyboard",
-  "version": "2.20.1",
+  "version": "2.20.2",
   "description": "On-screen Javascript Virtual Keyboard",
   "main": "build/index.js",
   "types": "build/index.d.ts",
@@ -56,12 +56,12 @@
     "chalk": "2.4.2",
     "copy-webpack-plugin": "^5.0.0",
     "css-loader": "2.1.1",
-    "dotenv": "6.2.0",
-    "dotenv-expand": "4.2.0",
+    "dotenv": "7.0.0",
+    "dotenv-expand": "5.0.0",
     "esdoc": "^1.1.0",
     "esdoc-ecmascript-proposal-plugin": "^1.0.0",
     "esdoc-standard-plugin": "^1.0.0",
-    "eslint": "5.15.1",
+    "eslint": "5.15.2",
     "eslint-config-react-app": "^3.0.8",
     "eslint-loader": "2.1.2",
     "eslint-plugin-flowtype": "3.4.2",
@@ -87,7 +87,7 @@
     "prettier-webpack-plugin": "^1.2.0",
     "react": "^16.8.4",
     "react-app-polyfill": "^0.2.2",
-    "react-dev-utils": "^7.0.5",
+    "react-dev-utils": "^8.0.0",
     "react-dom": "^16.8.4",
     "resolve": "1.10.0",
     "sass-loader": "7.1.0",
@@ -98,7 +98,7 @@
     "webpack": "4.29.6",
     "webpack-dev-server": "3.2.1",
     "webpack-manifest-plugin": "2.0.4",
-    "workbox-webpack-plugin": "4.1.0"
+    "workbox-webpack-plugin": "4.1.1"
   },
   "eslintConfig": {
     "extends": "react-app",