Update README.md

Author: vshymanskyy

README.md

@@ -28,8 +28,8 @@ __________
 **Blynk [Arduino Library](https://github.com/Blynk-Technologies/blynk-library/releases/latest)**
 
 **Blynk Mobile App: 
-[<img src="https://cdn.rawgit.com/simple-icons/simple-icons/develop/icons/googleplay.svg" width="18" height="18" /> Google Play](https://play.google.com/store/apps/details?id=cloud.blynk) | 
-[<img src="https://cdn.rawgit.com/simple-icons/simple-icons/develop/icons/apple.svg" width="18" height="18" /> App Store](https://apps.apple.com/us/app/blynk-iot/id1559317868)**
+[<img src="https://cdn.simpleicons.org/googleplay/363636/d1d1d1" width="18" height="18" /> Google Play](https://play.google.com/store/apps/details?id=cloud.blynk) | 
+[<img src="https://cdn.simpleicons.org/apple/363636/d1d1d1" width="18" height="18" /> App Store](https://apps.apple.com/us/app/blynk-iot/id1559317868)**
 
 ## Quickstart: Arduino + Ethernet shield