Update WiFiManager.h

Change byte to uint8_t to cope with breaking change in 3.2.0 of platform:  esp8266/Arduino#8090

Author: dperish

WiFiManager.h

@@ -426,8 +426,8 @@ class WiFiManager
     IPAddress     _sta_static_dns;
 
     // defaults
-    const byte    DNS_PORT                = 53;
-    const byte    HTTP_PORT               = 80;
+    uint8_t       DNS_PORT                = 53;
+    const uint8_t HTTP_PORT               = 80;
     String        _apName                 = "no-net";
     String        _apPassword             = "";
     String        _ssid                   = ""; // var temp ssid