Updating dev dependencies

package.json

@@ -1,6 +1,6 @@
 {
   "name": "simple-keyboard",
-  "version": "2.7.6",
+  "version": "2.7.7",
   "description": "On-screen Javascript Virtual Keyboard",
   "main": "build/index.js",
   "scripts": {
@@ -76,7 +76,7 @@
     "prop-types": "^15.6.1",
     "raf": "3.4.0",
     "react": "^16.2.0",
-    "react-dev-utils": "^4.2.1",
+    "react-dev-utils": "^4.2.2",
     "react-dom": "^16.2.0",
     "style-loader": "0.19.0",
     "sw-precache-webpack-plugin": "0.11.4",