Updating firebase fingerprint

The fingerprint changed on 2 Aug 2018.
This is the new fingerprint

Author: yehiyam

Diff for: src/FirebaseHttpClient.h

@@ -40,6 +40,6 @@ class FirebaseHttpClient {
 };
 
 static const char kFirebaseFingerprint[] =
-      "B8 4F 40 70 0C 63 90 E0 07 E8 7D BD B4 11 D0 4A EA 9C 90 F6";
+      "6F D0 9A 52 C0 E9 E4 CD A0 D3 02 A4 B7 A1 92 38 2D CA 2F 26";
 
 #endif  // FIREBASE_HTTP_CLIENT_H