updated icons

thanks for the hint @tw2113

Author: pfefferle

package.json

@@ -11,12 +11,12 @@
   },
   "devDependencies": {
     "genericons-neue": "^4.0.5",
-    "grunt": "^1.4.1",
+    "grunt": "^1.6.1",
     "grunt-checktextdomain": "^1.0.1",
     "grunt-contrib-copy": "^1.0.0",
     "grunt-contrib-sass": "^2.0.0",
     "grunt-wp-readme-to-markdown": "~2.1.0",
-    "simple-icons": "^9.0"
+    "simple-icons": "^9.12"
   },
   "license": "MIT",
   "bugs": {